Earbuds / Compare

Bose Ultra Open Earbuds (2nd Gen) vs soundcore AeroFit 2 Pro

A

Product A: Bose

Ultra Open Earbuds (2nd Gen)

71 of 166 known

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B

Product B: soundcore

AeroFit 2 Pro

81 of 166 known

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Every value links to where we found it.

Only differences

ABose Ultra Open Earbuds (2nd Gen)

Bsoundcore AeroFit 2 Pro

General

7 of 8 differ

Series

Not available

AeroFit1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Listed in the AeroFit line of open-ear earbuds.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

897806-0010, 444638, 638L, 638R3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026US Black SKU from exact retailer source also cited below. Original multilingual guide regulatory printed pages 4 and 7: case 444638, left 638L, right 638R.4Retailer pagebhphotovideo.com/c/product/2001094-REG/bose_897806_0010_ultra_open_true_wireless.htmlRead 8 October 2026Exact US Black retailer listing MFR 897806-0010. Regulatory 444638/638L/638R are separately proved by the original manufacturer guide.

A3875, A3875Z11, A3875Z21, A3875ZQ1, A3875Z31, A3875G11, A3875G21, A3875GQ12Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026US store SKUs A3875Z11 Matte Black, A3875Z21 Gloss White, A3875ZQ1 Matte Purple and A3875Z31 Gloss Blue.3Maker product pageeu.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026EU store SKUs A3875G11, A3875G21 and A3875GQ1. The EU store has no blue SKU.9Regulatory filingsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000036614/en_US/000036614.pdfRead 15 October 2026EU and UK Declaration of Conformity: product soundcore AeroFit 2 Pro, model A3875.

GTIN / EAN

0178178627144Retailer pagebhphotovideo.com/c/product/2001094-REG/bose_897806_0010_ultra_open_true_wireless.htmlRead 8 October 2026Exact US Black MFR 897806-0010 UPC 017817862714.

194644317744, 194644274528, 194644274535, 194644274542, 1946442745112Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026Barcodes in the US store product data: 194644317744, 194644274528, 194644274535 and 194644274542.3Maker product pageeu.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026EU black barcode 194644274511. The EU white and purple SKUs list the same barcodes as the US rows.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

17 September 20262Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026September 17, 2026 announcement. US availability October 1, 2026, preorders September 19. Release date follows primary rather than SoundGuys October 2 metadata.

6 January 202611Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Maker blog dated 15 January 2026 about the CES 2026 Innovation Awards honoree. SoundGuys dates the CES announcement to 6 January 2026.14Reviewsoundguys.com/the-soundcore-aerofit-2-pro-are-open-earbuds-that-transform-into-anc-earbuds-150692Read 15 October 2026Article dated 6 January 2026: announced at CES 2026.

Status

Available1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Available1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Store product data shows all four colours available. The store page HTML showed a sold-out label when fetched, while the product data feed marked every variant available. The maker blog and reviews say it is on sale.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: available now in Matte Black, Matte Purple and Gloss White.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Bose Ultra Open Earbuds2Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026Bose's September 2026 release calls the Ultra Open Earbuds (2nd Gen) the next generation and compares them with the first-generation model.

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$2992Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026US $299 launch price for Ultra Open Earbuds 2nd Gen. Sport Open $199 is a separate model.

$179.991Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026US store price 179.99 USD. Excludes sales tax.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: regular MSRP 179.99 USD. A launch promotion of 149.99 USD through 31 March 2026 is not an MSRP and is not stored.14Reviewsoundguys.com/the-soundcore-aerofit-2-pro-are-open-earbuds-that-transform-into-anc-earbuds-150692Read 15 October 2026Article: 179.99 USD, the same as the AeroFit 2 at launch.15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: 179.99 USD and 179.99 GBP.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€299.956Maker product pagebose.de/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 10 October 2026Bose Germany store showed 299,95 EUR incl. VAT on 2026-10-10 with no strike-through or discount, nine days after the October 1 release. Bose France showed the same 299.95 EUR. Neither page labels the figure as a launch price. It is read as the launch list price because the product is days old. The first-generation model sits at 349,95 EUR on the same page.

€179.993Maker product pageeu.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026EU store price 179.99 EUR including VAT, no compare-at price. The German review price is the same. The EU store listing is dated April 2026, after the January launch, so the German review gives the launch evidence.16Reviewkopfhoerer.de/test/soundcore-aerofit-2-proRead 15 October 2026German review dated 21 January 2026 gives 179,99 EUR for the AeroFit 2 Pro.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

US, EU1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026US store. The EU store lists the product too.3Maker product pageeu.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026EU store product data.

ColoursiThe maker's own colour names

Black, White Smoke, Cherry Chocolate, Olive Green, Sky Pink1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Exact US model family. Last three colors are limited editions. Reference is US Black 897806-0010.

Matte Black, Gloss White, Matte Purple, Gloss Blue1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Colour selector: Matte Black, Gloss White, Matte Purple and Gloss Blue.2Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc.jsRead 15 October 2026Colour option values in the product data.

Segment

Not available

Sport1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page: use during workouts or the commute. The maker blog calls it suited to jogging and cycling. Stored as sport like the AeroFit 2.

Design

1 of 4 differ

Form factoriIn-ear seals the ear canal with a tip. Semi-in-ear rests in the outer ear without a seal. Open-ear leaves the ear canal unobstructed.

Open-ear1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Open-ear1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page title and text: 2-in-1 earbuds that switch between open-ear and ANC modes. The product is dual-form. The open-ear form is stored because the store sells it as open-ear earbuds with ANC. In ANC form the maker calls it semi-in-ear.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Port double section: two wearing forms, Open-Ear and ANC. In Open-Ear form the earbuds rest on the ears and leave the ear canals clear.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: Open-Ear form keeps the drivers outside the ear canal. ANC form pivots the hooks inward to create a seal and the maker calls it Semi-In-Ear ANC.

Bud shapeiStem describes an extending control or microphone stalk. Stemless describes a compact body without a stalk.

Ear cuff1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Ear hook6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Overview and wearing sections: an ear hook with five levels over the outer ear.

Use one bud aloneiWhich earbud can operate alone. This does not mean two earbuds can play from different sources.

Either bud1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Either bud5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 26: single-ear use is supported. Dual-ear pairing, reset and custom EQ cannot be used with one earbud.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Controls and power sections: hold one earbud button for 3 seconds to power on a single earbud.

RGB lighting

Not available

Not available

Drivers and sound

8 of 17 differ

Drivers per budiAudio transducers in one earbud. Rows distinguish their type, acoustic role and published diameter. Do not count microphones.

ABose Ultra Open Earbuds (2nd Gen)

Type	Count per earbud
Dynamic	1

Source4Retailer pagebhphotovideo.com/c/product/2001094-REG/bose_897806_0010_ultra_open_true_wireless.htmlRead 8 October 2026Exact model specifications explicitly list Dynamic and 1 per Earpiece. Acoustic role and diameter not published. No transfer from first generation or separate Sport Open model.

Bsoundcore AeroFit 2 Pro

Type	Diameter (mm)	Count per earbud
Dynamic	11.8	1

Source1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page text: 11.8 mm composite drivers. The type and count come from the Anker Japan page and TechRadar.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications: speaker 11.8 mm.10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Page: 11.8 mm dynamic driver with an LCP diaphragm.15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: a custom-built 11.8 mm driver in each earbud. The review spec table also says 11.8 mm and one passage says 10.8 mm, which is read as a typo.

Driver typeiPublished transducer technology. High-excursion, composite and neodymium do not by themselves establish a driver type.

Dynamic4Retailer pagebhphotovideo.com/c/product/2001094-REG/bose_897806_0010_ultra_open_true_wireless.htmlRead 8 October 2026Exact retailer Dynamic entry. Source microphone 4, NFC, touch-sensor and supplied-cable claims contradict stronger primary documents and are not used.

Dynamic10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Page: 11.8 mm dynamic driver.

Driver sizeiLargest explicitly published circular driver diameter in one earbud. A rectangular driver width is not a diameter.

Not available

11.8mm=CalculatedFrom Drivers per bud

Drivers per budiTotal audio transducers in one earbud, summed from explicit driver quantities. A row with an unknown quantity makes the total unknown.

1=CalculatedFrom Drivers per bud

1=CalculatedFrom Drivers per bud

Diaphragm material

Not available

LCP10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Page: LCP coated diaphragm.

Frequency responseiPublished acoustic frequency response of the earbuds. Codec transmission bandwidth alone does not qualify. Conditions belong in the source note.

Not available

Min20 HzMax40 kHz6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications: 20 Hz to 20 kHz, and 40 kHz with LDAC enabled. The upper limit is stored with LDAC.

Impedance

Not available

16Ω6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications: 16 ohm.

SensitivityiPublished acoustic sensitivity. The electrical reference and frequency must be stated in sensitivity_reference or the source note.

Not available

Not available

Sensitivity reference

Not available

Not available

Max sample rateiHighest supported audio sample rate under the codec and source-device conditions in the source note. This does not establish lossless playback.

Not available

Not available

Max bit depthiHighest supported audio bit depth under the codec and source-device conditions in the source note. Bluetooth version alone does not establish this.

Not available

Not available

Adaptive EQiAn inner mic tunes the sound to your ear in real time

Not available

Not available

Personalised soundiA profile from a hearing test or ear scan

Not available

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Hear ID section: a short in-app test of preferred music styles and sound types builds a profile. It is a preference test, not a hearing test.

Onboard EQ

Not available

Not available

Custom EQ bandsiNumber of independently adjustable custom equalizer frequency bands. Availability may require current firmware, an app or a compatible device.

33Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 19 explicitly lists bass, midrange and treble adjustment in Bose app. At high volumes adjustments may be reduced to avoid distortion.

86Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026EQ section: eight sliders in the custom equalizer. The guide also lists 22 EQ presets, which are not named, so no preset list is stored.

EQ presetsiNamed equalizer sound presets. Noise-control modes and spatial-audio modes are separate features.

Bass Boost, Treble Reducer5Reviewsoundguys.com/bose-ultra-open-earbuds-2nd-gen-review-164060Read 8 October 2026Review names Bass Boost and Treble Reducer as examples. Stored list only contains these proven names, not an inferred complete preset inventory.

Not available

Volume limit

Not available

Not available

Spatial audio

1 of 2 differ

Spatial audioiNamed spatial or surround audio processing supported with the source and platform conditions stated in the source note.

Bose Immersive Audio, Cinema Mode with Bose TrueSpatial2Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026Launch paragraph specifically names Cinema Mode powered by Bose TrueSpatial, spatializing video/podcasts with centered dialogue. Manual separately proves Bose Immersive Audio and its Still/Motion settings.3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed pages 21 to 24 Immersive Audio Off/Still/Motion and Stereo/Immersion/Cinema listening modes. Cinema uses Still plus video spatialization. Current maker/launch names Cinema TrueSpatial.

Spatial Audio6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Spatial audio section: Head Tracking with Music and Movie modes, or Fixed spatial sound.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: spatial audio with head tracking.

Head trackingiSpatial audio changes with head movement. Static spatial processing alone does not qualify. Compatible device or content requirements belong in the source note.

Yes3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 21 Still holds virtual speakers in position while head moves, then recenters after stopping. Motion setting follows the user. No source-specific spatial content required.

Yes1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page text: dynamic head tracking moves the sound around you.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Spatial audio section: surround sound that follows head movement.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: spatial audio with head tracking.

Noise cancelling

3 of 11 differ

Active noise cancelling

No1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026ANC section: ANC and Normal modes in the soundcore app, or hold an earbud for 2 seconds. It works only when both earbuds are in ANC form.

ANC typeiFeedforward uses exterior microphones. Feedback uses interior microphones. Hybrid uses both. Adaptive control is separate from microphone placement.

Not available

Not available

ANC microphones in both earbudsiPhysical microphones used by ANC across the pair. A shared call and ANC microphone counts once. Case microphones and vibration sensors are excluded.

Not available

613Maker product pagede.soundcore.com/blogs/earbuds/soundcore-aerofit-2-pro-vs-powerbeats-pro-2Read 15 October 2026German maker blog: a precise acoustic system with six ambient noise sensors. SoundGuys calls it a six-microphone array. The split between earbuds is not stated.14Reviewsoundguys.com/the-soundcore-aerofit-2-pro-are-open-earbuds-that-transform-into-anc-earbuds-150692Read 15 October 2026Article: in sealed earbud mode a six-microphone array with Adaptive ANC 3.0.

Adaptive ANCiANC strength or calibration adjusts automatically to noise, fit or ear acoustics. The source note states the adjustment conditions.

Not available

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026ANC section: the app ANC mode adapts to your ears and your environment. Tips text: adaptive noise cancellation turns on in ANC form.12Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-vs-aerofit-2-proRead 15 October 2026Blog: adaptive ANC using four integrated microphones and AI algorithms.14Reviewsoundguys.com/the-soundcore-aerofit-2-pro-are-open-earbuds-that-transform-into-anc-earbuds-150692Read 15 October 2026Article: Adaptive ANC 3.0 adjusts noise canceling up to 180 times per second.

ANC levelsiNumber of selectable ANC strength levels. Excludes ANC off, transparency and activity profiles unless they explicitly set distinct strength levels.

Not available

Not available

ANC attenuation (claimed)iManufacturer maximum claimed noise attenuation. Frequency and measurement conditions belong in the source note. This is not reviewer-measured overall attenuation.

Not available

Not available

Transparency mode

Not available

Not available

Adjustable transparency

Not available

Not available

Automatic ANC and transparency blendiAutomatically blends active cancellation with ambient sound. Automatic activity-based switching between separate modes alone does not qualify.

Not available

Not available

Conversation detection

Not available

Not available

Wind noise reductioniA documented physical design or processing feature for reducing wind noise. The source note distinguishes mesh or shape changes from selectable processing.

Not available

Not available

Measured

4 of 23 differ

Frequency response notes (measured)iMeasured by a reviewer, not claimed by the maker

Bass extends lower than the first generation but remains below the review preference curve below about 80 Hz. Treble is less harsh than the original. The review reports bass distortion at higher listening volumes.5Reviewsoundguys.com/bose-ultra-open-earbuds-2nd-gen-review-164060Read 8 October 2026Exact review objective measurements compare with the SoundGuys headphone preference curve. No numeric target deviations or graph-derived values stored.

Not available

Bass amount (measured)iDeviation from the review source target in the bass range. Positive means more bass. Target, test method and settings belong in the source note.

Not available

Not available

Treble amount (measured)iDeviation from the review source target in the treble range. Positive means more treble. Values from different targets may not be directly comparable.

Not available

Not available

Deviation from target (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Consistency between fittings (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Harmonic distortion (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Sound leakage (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Noise isolation (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Noise isolation, best (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Passive isolation (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Call quality notes (measured)iMeasured by a reviewer, not claimed by the maker

Artificial test-head recordings have clear voice in quiet conditions. Office and street noise suppression also removes much of the voice, leaving it muffled. The windy sample contains almost no audible speech. The non-vibrating test head cannot activate the voice pickup units as a real person would, so real calls may differ.5Reviewsoundguys.com/bose-ultra-open-earbuds-2nd-gen-review-164060Read 8 October 2026Exact review quiet, office, street and windy recordings use an artificial test head that does not vibrate like a real human head. The voice pickup units cannot work as they do on a real person, so actual calls may differ. These sample results cannot establish complete real-person VPU-assisted call performance.

Not available

Mic low-frequency extension (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic high-frequency extension (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic speech-to-noise ratio (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Latency (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Bluetooth latency, worst (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

2.4 GHz latency, worst (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Latency in game mode (measured)iThe best case the buds can reach. Measured by a reviewer

Not available

Not available

Battery life (measured)iReviewer-tested operation from one full charge of the earbuds. Excludes case recharges. ANC, codec, connection, volume and tested edition belong in the row or source note.

ABose Ultra Open Earbuds (2nd Gen)

ANC	Hours (h)
No	13.02

Source5Reviewsoundguys.com/bose-ultra-open-earbuds-2nd-gen-review-164060Read 8 October 2026One-week review of maker-supplied exact 2nd Gen Cherry Chocolate 897806-0030. Reported standardized battery test 13 h 1 min converted to 13.0167 h. ANC absent. Review frames this as standard playback before reduction with Immersive Audio/AutoVolume, but does not explicitly state those test flags, codec, firmware, source or level. These remain unknown. Header 10 g and October 2 release metadata not used.

Bsoundcore AeroFit 2 Pro

Not available

Longest tested use per chargeiHighest earbuds-only duration among stored reviewer tests. Modes and settings may differ between tests and products.

13.02h=CalculatedFrom Battery life (measured)

Not available

Battery life with case (measured)iReviewer-tested total including earbuds and case recharges. Do not calculate this by multiplying one-charge runtime by claimed recharge count.

Not available

Not available

Full charge time (measured)iBuds in the case, 0 to 100 %. Measured by a reviewer

Not available

Not available

Weight per bud (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Microphones and calls

2 of 7 differ

Voice microphones in both earbudsiPhysical call and beamforming microphones across the pair. Excludes case microphones and vibration sensors. Shared ANC microphones can also count here when used for calls.

22Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026One dedicated microphone and one voice pickup unit in each earbud. Two physical voice microphones across pair, not four. VPU excluded. Retailer four-voice-mic table is not used.

41Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page text: 4 mics with AI-boosted call technology. The split between earbuds is not stated.12Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-vs-aerofit-2-proRead 15 October 2026Blog: four integrated microphones with AI algorithms for adaptive ANC. The German blog says four microphones for calls.13Maker product pagede.soundcore.com/blogs/earbuds/soundcore-aerofit-2-pro-vs-powerbeats-pro-2Read 15 October 2026German maker blog: four microphones with AI noise reduction for calls.

All microphones in both earbudsiEvery physical microphone across the pair, including call and ANC microphones. Shared microphones count once. Excludes the charging case and voice vibration sensors.

21Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Technical table explicitly states 2 Microphones for the product. Launch press release separately states one dedicated microphone plus one voice pickup unit in each earbud. VPU is excluded from the physical microphone total.

Not available

Bone conduction voice sensoriA dedicated bone or jaw conduction sensor for detecting speech vibrations. A microphone or speech-detecting accelerometer alone does not prove this architecture.

Not available

Not available

Mic noise reduction

AI2Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026SpeechClarity explicitly described as AI-enhanced voice-isolation technology.

AI1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026Page text: AI-boosted call technology.

Call audio bandwidthiHighest supported call-audio bandwidth. Compatible phone, operating system, call app or network requirements belong in the source note.

Not available

Not available

Mic mute controliAn earbud control that mutes the microphone during calls. Includes touch or pressure gestures and physical buttons. Phone/app-only controls do not qualify.

Not available

Not available

SidetoneiHear your own voice in calls

Not available

Not available

Connectivity

6 of 18 differ

Chip

Not available

Not available

Connections

Bluetooth1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Bluetooth6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Power on and pairing section and specifications: Bluetooth 6.1 only.

Bluetooth

5.41Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

6.14Maker product pageservice.soundcore.com/product-description/a08e2000006OrpTAASRead 15 October 2026Spec list: Bluetooth version 6.1.5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 1: Bluetooth 6.1.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications: Bluetooth 6.1.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: Bluetooth 6.1 with multipoint.

Bluetooth codecs

SBC, AAC, aptX Adaptive2Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026Both new models SBC/AAC. Ultra Open 2 additionally aptX Adaptive via Snapdragon Sound on compatible Android devices. No aptX Lossless or bitrate/sample-rate inferred.

SBC, AAC, LDAC4Maker product pageservice.soundcore.com/product-description/a08e2000006OrpTAASRead 15 October 2026Spec list: supported Bluetooth codecs LDAC, SBC, AAC.5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 2: SBC, AAC and LDAC.16Reviewkopfhoerer.de/test/soundcore-aerofit-2-proRead 15 October 2026Review: SBC and AAC plus LDAC as the Hi-Res codec.

Bluetooth profiles

Not available

Not available

LE Audio

Not available

Not available

Auracast

No5Reviewsoundguys.com/bose-ultra-open-earbuds-2nd-gen-review-164060Read 8 October 2026Exact October 7, 2026 review explicitly says no Auracast. Bluetooth LE Audio capability itself is not stated and remains unknown.

Not available

MultipointiConcurrent Bluetooth connections to multiple source devices. Pairing memory and switching through a manufacturer account alone do not qualify.

Yes3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Yes5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 21: Dual Connections connect two devices.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Dual connection section: connect two Bluetooth devices at the same time. Dual connections are on by default.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: Bluetooth 6.1 with multipoint connection.

Multipoint devicesiMaximum source devices concurrently connected by Bluetooth, not the number remembered in pairing history.

23Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

25Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 21 and 22: two devices at once. A third device needs one removed first.12Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-vs-aerofit-2-proRead 15 October 2026Blog: connect to two devices simultaneously.16Reviewkopfhoerer.de/test/soundcore-aerofit-2-proRead 15 October 2026Review: up to two sources at the same time.

Multipoint with LDACiMany buds turn multipoint off on LDAC

Not available

Not available

Paired devices rememberediMaximum remembered Bluetooth source pairings. This is separate from simultaneous multipoint connections.

63Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 35 says up to six devices stored, separately two actively connected. No current exact support revision found establishing a different memory count.

85Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 12: up to 8 Bluetooth devices remembered.

Automatic switching between own devicesiThrough the maker's account

Not available

Not available

Fast pairing

Google Fast Pair3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Not available

Audio sharingiShare one stream with a second pair

Not available

Not available

Wireless range (claimed)

9m3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 36 explicitly gives 30 ft or 9 m. Use maker metric value rather than converting rounded 30 ft to 9.144 m.

10m5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 18: 33 ft or 10 m.

Wireless receiveri2.4 GHz dongle

Not available

Not available

Receiver connector

Not available

Not available

Simultaneous 2.4 GHz and Bluetooth audioiBoth connection types can play audio together. Quick switching between independent modes does not qualify.

Not available

Not available

Latency

3 of 3 differ

Low latency mode

Not available

Yes15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: the app brings a low-latency mode and a spatial audio mode.16Reviewkopfhoerer.de/test/soundcore-aerofit-2-proRead 15 October 2026Review: the app has a gaming mode that reduces latency.

Claimed latency

ABose Ultra Open Earbuds (2nd Gen)

Not available

Bsoundcore AeroFit 2 Pro

Connection	Latency (ms)
Bluetooth	200

Source5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 31: about 200 ms. The connection is Bluetooth. No mode is stated.

Lowest claimed latency

Not available

200ms=CalculatedFrom Claimed latency

Compatibility

1 of 4 differ

PlatformsiPlatforms with documented audio support. App availability and advanced features can be more limited. Edition-specific support is listed in variants.

Android, iOS4Retailer pagebhphotovideo.com/c/product/2001094-REG/bose_897806_0010_ultra_open_true_wireless.htmlRead 8 October 2026Exact listing app-compatible Android and iOS. Generic Bluetooth computers also supported by maker, but named Windows/macOS/Linux platform support is not stated.

Android, iOS6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Pairing and volume sections give Android and iOS steps, and the LDAC section names Android 8.0 or later. FAQ 7 names the App Store. A support article about a MacBook exists, but its text could not be read, so macOS is not stored.

Connection per platformiDocumented audio connection for each platform. USB-C phone routes require a compatible port. Platform edition and microphone restrictions belong in source notes or feature requirements.

Not available

Not available

Features that need a specific deviceiDevice, operating system, firmware, codec, content, account or region requirements for a named feature.

ABose Ultra Open Earbuds (2nd Gen)

Feature	Needs
Google Fast Pair	Android 6 or higher, Bluetooth and Location enabled, Google Play Services notifications enabled.
Snapdragon Sound / aptX Adaptive	Snapdragon Sound-certified source device, such as a compatible Android device.
Device voice control	Assign an earbud shortcut in the Bose app. Uses the connected device's voice assistant.
Spotify Tap	Assign an earbud shortcut in the Bose app and use the current Spotify app.

Source3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Bsoundcore AeroFit 2 Pro

Feature	Needs
LDAC	Android 8.0 or later. Turn it on in the soundcore app under Settings, Sound Mode, Preferred audio quality. It shortens playback time.
Active noise cancelling	Works only when both earbuds are in ANC form. It cannot be turned on in Open-Ear form. Automatic switching is on by default and Smart Toggle in the app turns it off.
Hear ID	Set up in the soundcore app under Sound Effects, EQ, Preference. The Open-Ear form does not support the Hear ID test, so keep the earbuds in ANC form.
AI translation	The phone must be connected to the soundcore app, version 3.8.7 or higher, and Dual Connections must be turned off.
Anka AI assistant	Latest soundcore app with the earbuds connected to the app. The assistant cannot open or control other apps.

Source5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 7: the AI translation feature needs soundcore app version 3.8.7 or higher.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026ANC, Hear ID, AI assistant, AI translation and LDAC sections.

Official licence

Not available

Not available

Battery and charging

10 of 13 differ

Battery per budiBattery cell capacity of one earbud. The source note states typical or rated capacity. Charging input current is not capacity.

Not available

60mAh5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 3: 60 mAh for each earbud. Typical or rated basis is not stated. The safety sheet gives a nominal battery voltage of 3.85 V. A German comparison page lists a different figure for the earbuds, so the FAQ is used.

User-replaceable earbud batteryiThe maker documents normal battery replacement by the user with its approved procedure and tools. Service or recycling disassembly does not count.

No3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Regulatory and legal information, English printed page 5: "DON'T attempt to remove the rechargeable lithium-ion battery from this product. Contact your local Bose retailer or other qualified professional for removal." No user replacement procedure is documented. Page 3 also says to contact Bose customer service for battery service options.

No8Maker spec sheet (PDF)lp.ankerjapan.com/hubfs/aoos/manual/A3875Safety.pdfRead 15 October 2026Safety sheet: the product contains non-replaceable lithium ion batteries, nominal 3.85 V, and the user should not replace them.

Claimed battery lifeiManufacturer maximum runtime under the stated mode, codec and spatial processing state. Name the spatial or immersive processing mode and other conditions in source notes. Omit unspecified settings. with_case false means one charge of the earbuds. true means earbuds plus case recharges.

ABose Ultra Open Earbuds (2nd Gen)

Mode	Spatial audio	Includes case recharges	Hours (h)
ANC off	No	No	9
ANC off	Yes	No	5
ANC off	No	No	5
ANC off	Yes	No	4

Source3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 31 footnote 3: Bose April 2026 production-representative units, IEC 60268-1 pink noise via Bluetooth A2DP, RSSI -75 dBm, playback loudness 75 dBA, three-band EQ zero. Codec not stated. Rows in order: Immersive Audio Off + Auto Volume Off 9 h, Immersive On + Auto Volume Off 5 h, Immersive Off + Auto Volume On 5 h, both On 4 h. ANC absent. Earbuds-only maxima. These four claims are explicit, not a combined 5 h unspecified condition.

Bsoundcore AeroFit 2 Pro

Mode	Codec	Includes case recharges	Hours (h)
ANC off	Not available	No	7
ANC off	Not available	Yes	34
ANC on	Not available	No	5
ANC on	Not available	Yes	24
ANC on	LDAC	No	3
Call	Not available	No	4
Call	Not available	Yes	20

Source5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 9, 10 and 11, with music at 50 percent volume and calls at 60 percent volume. Open-Ear form 7 hours and 34 hours with the case. ANC form 5 hours and 24 hours with the case. With LDAC the ANC form gives about 3 hours. The FAQ also gives 6 hours with LDAC in the Open-Ear form, but the CES blog says LDAC cuts about 3 hours in that form, so that row is not stored. Calls are about 4 hours in both forms. Open-Ear form is stored as ANC off because ANC cannot be turned on there. ANC form is stored as ANC on.10Maker product pageankerjapan.com/products/a3875Read 15 October 2026FAQ on the page: ANC off 7 hours and 34 hours with the case in Open-Ear form, 5 hours and 24 hours in ANC form, calls about 4 hours.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog footnote, internal lab testing: Open-Ear form 7 hours and 34 hours with the case, ANC form 5 hours and 24 hours with the case. Calls up to 4 hours in Open-Ear form with 20 hours with the case. In ANC form calls are up to 4 hours with ANC on and 5 hours with ANC off, about 20 and 25 hours with the case. The call mode cannot split ANC on and off, so the 4 and 20 hour rows are stored. LDAC cuts about 3 hours in Open-Ear form and 2 hours in ANC form.

Longest claimed use per chargeiHighest earbuds-only runtime among all stored modes. This can be ANC off, Hearing Aid, heart-rate or call use. Read the battery table and source conditions.

9h=CalculatedFrom Claimed battery life

7h=CalculatedFrom Claimed battery life

Playback per charge with ANC (claimed)iHighest claimed earbuds-only playback with ANC enabled. Codec and spatial-audio conditions belong in the source note.

Not available

5h=CalculatedFrom Claimed battery life

Playback per charge without ANC (claimed)iHighest claimed earbuds-only playback with ANC disabled. Codec and volume conditions belong in the source note.

9h=CalculatedFrom Claimed battery life

7h=CalculatedFrom Claimed battery life

Total with case (claimed)iHighest claimed runtime including the initial earbud charge and all case recharges. It is not the case recharge runtime alone.

Not available

34h=CalculatedFrom Claimed battery life

Total with case and ANC (claimed)iClaimed total playback with ANC, including the initial earbud charge and case recharges.

Not available

24h=CalculatedFrom Claimed battery life

Talk time (claimed)

Not available

4h=CalculatedFrom Claimed battery life

Full charge time, budsiTime to charge discharged earbuds to full in the case. Excludes charging the case itself or a combined buds-and-case result.

60min3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 31 earbuds up to 1 h. Depleted earbuds charged to 100% in a fully charged case. April 2026 maker testing.

60min5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 3: a full earbud charge takes about 1 hour. The French and Japanese spec tables agree.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications table: earbuds 1 hour.

Charging guidanceiPublished charging guidance or estimates that do not separate earbuds and case. Preserve the maker’s component scope and limits. Do not assign an unspecified or combined estimate to a component-specific numeric field.

Bose lists up to 19.5 additional hours from the case with Immersive Audio and Auto Volume off, up to 11 hours with either on, and up to 8.5 hours with both on. The original manual instead lists 28.5, 16 and 12.5 additional hours. Total playback including case recharges is not resolved.1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Current FAQ and September 17 launch both state 19.5 additional case hours at standard playback. Manual printed page 31 and footnote 4 explicitly say 28.5 additional, not total. No case total is calculated or stored.

The maker documents disagree on the charging times that include the case. The French guide gives 1.7 hours for the case and earbuds by cable and 2.6 hours wirelessly. The Japanese guide gives about 2 hours by cable and about 3 hours wirelessly in its text and 3.5 hours wirelessly in its spec table. The FAQ gives about 2 hours for the case and about 4 hours wirelessly. The case input is 5 V 0.8 A. The FAQ says a fully charged case recharges the earbuds 3 times.5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 4, 14 and 8.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Charging section and specifications: case wired 0.7 hour, case and earbuds 1.7 hours wired and 2.6 hours wireless. Input 5 V 0.8 A.7Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3875Manual.pdfRead 15 October 2026Japanese guide: case full charge about 2 hours by cable and about 3 hours wirelessly in the text. Its spec table gives earbuds and case about 2 hours by cable and about 3.5 hours wirelessly.

Quick charge timeiCharge duration corresponding to quick_charge_playback_h. Source note states earbuds-only or case-inclusive charging and playback settings.

10min3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

10min5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 16: a 10 minute recharge gives up to 3.5 hours of playback. The charging case does not support this feature.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: 10 minutes of charging provides up to 3.5 hours of playback.

Earbud playback after quick chargeiEarbuds-only runtime after quick_charge_min of charging. A claimed case-inclusive total does not qualify. ANC, codec and volume conditions belong in the source note.

2h3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 31 footnotes 1 and 2 depleted earbuds 10 min in fully charged closed case, then A2DP playback 75 dBA, EQ zero, Immersive Off and Auto Volume Off, up to 2 h. Codec unstated.

3.5h5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 16: up to 3.5 hours of playback after 10 minutes. This is earbud playback. Form, volume and ANC are not stated.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: up to 3.5 hours of playback after 10 minutes of charging.

Charging case

3 of 10 differ

Case batteryiCharging-case battery cell capacity. The source note distinguishes typical, rated and output capacity. USB output capacity alone does not qualify.

400mAh3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Regulatory information, English printed page 6, lists "Output Capacity: 400mAh (charge case)" next to the case input rating of 5 V, 1 A. The label says output capacity and gives no typical or rated qualifier. The case has no USB output, so it is read as the case battery capacity. Not charging input current.

750mAh5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 4: 750 mAh for the charging case. The user guides list 750 mAh in the spec table without naming the part.

User-replaceable case batteryiThe maker documents normal case battery replacement by the user with its approved procedure and tools. Service or recycling disassembly does not count.

No3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Same page 5 statement covers the product, listed as Model 444638 Wireless Earbuds with Charging Case. No user case battery procedure is documented.

No8Maker spec sheet (PDF)lp.ankerjapan.com/hubfs/aoos/manual/A3875Safety.pdfRead 15 October 2026Same sentence covers the product, including the charging case.

Case charging port

USB-C1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

USB-C6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Overview: USB-C charging port on the case.

Case full charge timeiBy cable, 0 to 100 %. A time the maker gives with the earbuds inside the case counts, and the source note says so.

180min3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 31 charging case up to 3 h wired. Time varies with earbuds inside case. Qi charging time not specified.

Not available

Wireless charging

Yes3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 29 supports a compatible third-party wireless charger sold separately. Charging standard not named.

Yes5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 6 and 13: the charging case supports wireless charging.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Charging section: place the case on a wireless charger for wireless charging.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: wireless charging supported.15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: the case facilitates wireless charging.

Wireless standardsiDocumented case charging standards or supported chargers. Magnetic alignment alone does not establish Qi2 certification.

Not available

Qi5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 6: wireless charging supports the Qi protocol. The FAQ also gives a maximum power output of 3 W. That figure is not stored because the safety sheet gives a different 0.005 to 5 W charger range and the field counts case input only.

Wireless charging poweriHighest wireless charging input the maker states for the case. The output of a charging pad does not count.

Not available

Not available

Speaker in caseiAn audio speaker physically in the charging case, for locating or status sounds. A microphone in the case is separate.

Not available

Not available

Screen on case

Not available

Not available

Case works as audio transmitteriCase relays external source audio through USB or an analog audio input. A case microphone for recording or calls does not qualify.

Not available

Not available

Controls

2 of 5 differ

ControlsiPressure is a force sensor that does not move, such as a stem you squeeze. Button is a key that moves when pressed.

Button3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Button6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Overview lists an earbud button. Controls table uses presses and holds.15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: each earbud has a physical button with a click, not a touch area.16Reviewkopfhoerer.de/test/soundcore-aerofit-2-proRead 15 October 2026Review: controlled through an integrated button on the back of each earbud.

Earbud volume controliHow earbud controls adjust volume, including a voice command if supported. Phone or app controls alone do not qualify.

Buttons3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Buttons6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Controls table: one press on the right earbud raises volume and one press on the left lowers it.

Gestures

Press, Double-press, Triple-press, Press and hold, Press, then press and hold3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Press twice (left or right): play or pause, Press once (right): volume up, Press once (left): volume down, Press once (left or right): answer a call, Hold for 2 seconds (left or right): reject an incoming call or end a call, Hold for 2 seconds (left or right): turn ANC on or off, Hold for 3 seconds (left and right): power off, Hold for 3 seconds on one earbud: power on that earbud6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Controls table with default button settings. L is left and R is right.

Remappable controls

Yes3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 20 independent press-and-hold shortcuts per earbud. Does not claim all button actions can be remapped.

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Controls section: touch and button controls can be customised in the app for volume, skip track, play or pause, and the voice assistant.

Voice assistant

Phone's native voice assistant3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 25 Device Voice Control: a shortcut set in the Bose app opens the connected device voice control through the earbud microphones. The product page also names Amazon Alexa with Alexa+ access, but the launch press release says Alexa+ support arrives with a firmware update after October 1, so Alexa is not stored.

Anka6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Smart assistant section: Anka, started by saying Hey Anka.

Sensors and health

2 of 9 differ

In-ear detection

Not available

No5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 15: the AeroFit 2 Pro does not feature wearing detection.

Sensors

Voice pickup unit2Press releasebose.com/pressroom/bose-sport-open-earbuds-and-bose-ultra-open-earbuds-2nd-genRead 8 October 2026Launch release: each earbud has one dedicated microphone and one voice pickup unit. Bose does not say how the unit senses speech, and its FAQ says the earbuds do not use bone conduction for sound. Stored as a verbatim sensor name only. voice_pickup_sensor stays empty.

Sensors that detect Open-Ear or ANC form6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Wearing section: built-in sensors detect which form is in use from whether the earbuds cover the ear canals. SoundGuys says two sensors in each earbud.14Reviewsoundguys.com/the-soundcore-aerofit-2-pro-are-open-earbuds-that-transform-into-anc-earbuds-150692Read 15 October 2026Article: two sensors in each earbud detect Open-Ear or sealed mode and recalibrate the EQ.

Heart rate sensor

Not available

Not available

Skin temperature sensingiA documented skin temperature sensor. This is separate from the operating temperature range or a heart-rate sensor.

Not available

Not available

Hearing aid featureiAmplification for mild to moderate hearing loss

Not available

Not available

Medical clearances

Not available

Not available

Hearing testiA documented hearing assessment feature, including consumer sound-personalization tests. Medical diagnostic clearance must be stated separately.

Not available

Not available

Hearing protectioniLimits sudden loud sounds

Not available

Not available

Health features

Not available

Not available

Fit and durability

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Ear tips includediTip sizes supplied with the product, including the pair fitted to the earbuds. Do not list separately sold sizes as included.

Not available

Not available

Ear tip materials

Not available

Not available

StabilisersiPhysical stabilizing fittings or structures. Stability bands are separate from fins, wings and ear hooks.

Not available

Ear hook6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Wearing sections: an ear hook that slides between five levels.

Ear tip fit test

Not available

Not available

Dust and water rating, buds

IPX41Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

IP554Maker product pageservice.soundcore.com/product-description/a08e2000006OrpTAASRead 15 October 2026Spec list: waterproof rating for the earbuds IP55.5Maker product pageservice.soundcore.com/article-description/soundcore-AeroFit-2-Pro-FAQRead 15 October 2026FAQ 5: earbuds IP55. The charging case is not water resistant, so no case rating is stored.6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Specifications: IP55.11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: rated IP55 for water and dust resistance.

Dust and water rating, case

Not available

Not available

Water resistance depth

Not available

Not available

Software

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Companion app

Bose app1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

soundcore6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026ANC, Hear ID and EQ sections refer to the soundcore app.

App platforms

Android, iOS1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

Android, iOS6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Smart assistant section: Android users adjust system settings so the app runs in the background. FAQ 7 names the App Store for iOS.

User firmware updates

Yes3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 43 automatic updates through connected Bose app when available. Planned Find Hub/Alexa+/Apple Music features are not stored as available without release evidence.

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026Firmware update section: the app announces new firmware and updates the earbuds.

Finding network

Not available

Not available

Precision findingiUWB in the case

Not available

Not available

Live translation

Not available

Yes6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026AI translation section: real-time and face-to-face translation in 100 languages.

Dimensions and weight

4 of 4 differ

Weight per budiMass of one earbud. Tip size and approximate values belong in the source note. Do not store pair or case-inclusive mass.

5.9g(0.2 oz)1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Bud Single 0.013 lb, converted using 453.59237 g/lb and rounded to 5.9 g. Published mass is rounded and applies to one bud. Retailer 5.7 g is not used.

10.5g(0.4 oz)10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Spec table: about 10.5 g per earbud and about 109 g for the charging case with the earbuds. TechRadar gives 10.4 g in its preview and 11 g in its review. The case-only weight is not stated by the maker, so it is not stored.

Bud dimensionsiDimensions of one earbud on the explicitly identified width, height and depth axes. An unlabeled tuple cannot establish those axes.

Width17.7Height18.9Depth27.7mm(0.7 × 0.7 × 1.1 in)1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Maker-labelled one-bud axes: 0.746 in H x 0.697 in W x 1.091 in D. Converted with 25.4 mm/in and rounded to 0.1 mm.

Not available

Case weightiCharging case mass excluding earbuds. Case-inclusive product mass does not qualify unless the source explicitly gives the empty-case figure.

49.9g(1.8 oz)1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Case 0.110 lb, converted using 453.59237 g/lb and rounded to 49.9 g. Published mass is rounded. Retailer 48.2 g is not used.

Not available

Case dimensionsiCharging-case width, height and depth on explicitly identified source axes. Report conflicting axis labels rather than reorder a tuple by appearance.

Width26.8Height47.5Depth66mm(1.1 × 1.9 × 2.6 in)1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Maker-labelled case axes: 1.870 in H x 1.056 in W x 2.598 in D. Converted with 25.4 mm/in and rounded to 0.1 mm.

Not available

Certifications

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Hi-Res AudioiThe Japan Audio Society logos. Hi-Res Audio Wireless is also written Hi-Res Wireless Audio.

Not available

Hi-Res Audio Wireless11Maker product pageus.soundcore.com/blogs/open-ear/aerofit-2-pro-ces-2026-awardRead 15 October 2026Blog: Hi-Res Audio certified with LDAC support on Android. The blog does not name the wireless logo. TechRadar names Hi-Res Audio Wireless, which is stored.15Reviewtechradar.com/audio/earbuds-airpods/anker-soundcore-aerofit-2-pro-reviewRead 15 October 2026Review: Hi-Res Audio Wireless certification and LDAC support.

Communication certifications

Not available

Not available

FCC IDs

A94638L, A94638R3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

Not available

Other certifications

Snapdragon Sound3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026Printed page 40 explicitly names Snapdragon Sound technology, paired with certified compatible source device.

CE, UKCA9Regulatory filingsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000036614/en_US/000036614.pdfRead 15 October 2026Declaration lists Directive 2014/53/EU for the EU and UK. CE and UKCA marks follow from the declaration.

In the box

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In the box

2 Bose Ultra Open Earbuds (2nd Gen), Charging case, Quick Start Guide, Safety Sheet1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026Maker list is corroborated by exact US Abt and original manual. No USB cable or power adapter included. The charging accessory is the case, despite generic technical-table charging-accessory Yes.

Earbuds, Charging case, USB-C and USB-A cable, Quick start guide10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Spec table package list for Japan: the unit, charging case, USB-C and USB-A cable and quick start guide. The Japan model numbers A3875N11, N21, N31 and NQ1 are not stored.

Cables included

ABose Ultra Open Earbuds (2nd Gen)

Not available

Bsoundcore AeroFit 2 Pro

Type
USB-C and USB-A cable

Source10Maker product pageankerjapan.com/products/a3875Read 15 October 2026Package list: one USB-C and USB-A cable. The length is not stated.

Links

Not compared

Product page

www.bose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.html1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026

us.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-anc1Maker product pageus.soundcore.com/products/a3875-aerofit-2-pro-open-ear-earbuds-with-ancRead 15 October 2026

Spec sheet

Not available

service.soundcore.com/product-description/a08e2000006OrpTAAS4Maker product pageservice.soundcore.com/product-description/a08e2000006OrpTAASRead 15 October 2026Soundcore support product page for the AeroFit 2 Pro. It lists a short spec list, the user guides and the EU declaration.

Manual

assets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdf3Owner's manualassets.bosecreative.com/asset/b512e4d6-8ac6-45c5-a4da-2e9aef467ef2/898298_OG_UOEBII27-HEADPHONEOPN_ML.pdfRead 8 October 2026

salesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdf6Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000038533/en_US/000038533.pdfRead 15 October 2026French user guide A3875 from the Soundcore knowledge base. No English PDF was found. The English guide is a support article that has no readable text.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

1 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

1year1Maker product pagebose.com/p/earbuds/bose-ultra-open-earbuds-2nd-gen/ULT2-HEADPHONEOPN.htmlRead 8 October 2026US one-year Bose limited warranty. Optional purchased BoseCare excluded.

1.5years8Maker spec sheet (PDF)lp.ankerjapan.com/hubfs/aoos/manual/A3875Safety.pdfRead 15 October 2026Safety sheet: 18-month limited warranty, with 12 months for India.

Both are also in the API. Back to all earbuds.