Earbuds / Compare

soundcore AeroFit 2 vs TOZO Open EarRing

A

Product A: soundcore

AeroFit 2

58 of 166 known

Change soundcore AeroFit 2

Compare the TOZO Open EarRing with

Search earbuds

B

Product B: TOZO

Open EarRing

44 of 166 known

Change TOZO Open EarRing

Compare the soundcore AeroFit 2 with

Search earbuds

All 166 fields

Every value links to where we found it.

Only differences

Asoundcore AeroFit 2

BTOZO Open EarRing

General

5 of 8 differ

Series

AeroFit3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Listed with the Soundcore AeroFit series.

Not available

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

A3874, A3874Z11, A3874Z21, A3874Z61, A3874Z31, A3874Z81, A3874G11, A3874G21, A3874G61, A3874G311Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026Store variants A3874Z11, Z21, Z61, Z31 and Z81. The EU store lists A3874G11, G21, G61 and G31.5Measurementsoundguys.com/anker-soundcore-aerofit-2-review-126119Read 13 October 2026

T130644Retailer pageamazon.com/dp/B0DHVFGGGRRead 21 October 2026Item details Model Number: T13064 on the Khaki and Pink listings (ASINs B0DHVFGGGR and B0DHVGWM65). Mfr Part Numbers T1308 (Khaki) and T1307 (Pink) differ by colour and are not stored. The same item details list impedance 32 ohm, driver 10 mm, Bluetooth range 20 m and latency 60 ms, which conflict with the maker page or repeat the values on TOZO A1 listings, so no other value is taken from that listing.5Regulatory filingfccid.io/giteki/220-JP8106Read 21 October 2026Japan Giteki certificate 220-JP8106 of 2024-09-26 to Shenzhen Worgo Technology Co., Ltd. lists T13064 with nine other T13 model numbers, so T13064 is a real TOZO model code. The certificate does not name the product and fits the October 2024 launch.

GTIN / EAN

194644036393, 194644210137, 194644210144, 194644210151, 194644262334, 194644284701, 194644284992, 194644284961, 1946442849851Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026Variant barcodes from the US store product data and the EU store product data.

717470228833, 717470228956, 7174702289706Maker product pagetozostore.com/products/openearring-headphone.jsonRead 20 October 2026Barcodes of the three store variants: Black 717470228833, Khaki 717470228956 and Rose Gold 717470228970. The check digits are valid.

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

Not available

Not available

Status

Available6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026Listed with a current Amazon US price.

Available1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026In stock on the TOZO store on 2026-10-20 at 49.99 USD.

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

Not available

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.

$99.995Measurementsoundguys.com/anker-soundcore-aerofit-2-review-126119Read 13 October 2026Spec table lists a price of $99.99.7Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026MSRP $100.

Not available

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.

Not available

Not available

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

US, EU1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 20262Maker product pageeu.soundcore.com/products/a3874-aerofit-2-open-earbuds.jsRead 13 October 2026EU store product data with SKUs A3874G11, G21, G61 and G31.

Not available

ColoursiThe maker's own colour names

Midnight Black, Pearl White, Minty Green, Midnight Blue, Brown, Black, Beige, Navy Blue1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026US store colours Midnight Black, Pearl White, Minty Green, Midnight Blue and Brown. EU store colours Black, Beige, Minty Green and Navy Blue. The EU store spells one colour Minity Green.

Black, Khaki, Rose Gold1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Colour picker and variants of the store feed: Black, Khaki and Rose Gold. The spec table and older images say Pink. The Rose Gold images were added to the page in September 2025, so Pink is read as the earlier name.

Segment

Sport6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026Catalogued under sports and fitness headphones.

Not available

Design

2 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 pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026Open-ear headphones with 4-level adjustable ear hooks.

Open-ear1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Type: Open-ear. The earbud sits outside the ear canal.

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

Ear hook1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026

Clip1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Page tagline: Open Ear Clip Wireless Headphones. Page text: open the C-shaped strip and clip the earbuds onto your ears.7Maker product pagetozostore.com/blogs/news/tozo-openwear-vs-tozo-open-earring-which-open-ear-fits-you-bestRead 20 October 2026Maker blog post: the Open EarRing uses a clip-on style design that rests on the ear without entering the ear canal.

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

Either bud4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026The guide has a section for single earbud use.

Not available

RGB lighting

Not available

Not available

Drivers and sound

5 of 17 differ

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

Asoundcore AeroFit 2

Type	Count per earbud
Dynamic	1

Source1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 202620 mm x 11.5 mm racetrack drivers with BassTurbo acoustics. The driver is rectangular, so no circular diameter is stored.3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Dynamic driver, 20 mm x 11.5 mm.

BTOZO Open EarRing

Type	Diameter (mm)	Count per earbud
Dynamic	12	1

Source1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Driver: 12mm dynamic driver. One driver per earbud is read from the singular spec row.7Maker product pagetozostore.com/blogs/news/tozo-openwear-vs-tozo-open-earring-which-open-ear-fits-you-bestRead 20 October 2026Maker comparison table: 12mm dynamic drivers.

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

Dynamic3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Dynamic driver in the comparison table.

Dynamic1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Driver: 12mm dynamic driver.

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

Not available

12mm=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

Not available

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

Min20 HzMax40 kHz4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 202620 to 20 kHz, and 20 to 40 kHz with LDAC enabled.

Min20 HzMax20 kHz1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Frequency response range: 20Hz-20kHz. No conditions are stated.

Impedance

16Ω4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

Not available

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

Not available

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.

87Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026Optional 8-band equalizer in the app. The French guide also names eight sliders on the custom equalizer page.

Not available

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

Not available

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.

3D Surround Sound3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Supports 3D audio.7Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 20263D Surround Sound setting in the app.

Not available

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

Not available

Not available

Noise cancelling

0 of 11 differ

Active noise cancelling

No3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Noise cancelling is not available on the AeroFit 2.

No1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Noise cancellation lists only ENC call noise reduction. The earbuds are open-ear and the page promotes awareness of surroundings.

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

Not available

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

Not available

Not available

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

2 of 23 differ

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

The bass rolls off steeply below about 125 Hz. Between 1.6 kHz and 6.3 kHz the response sits 7 to 16 dB above the SoundGuys preference curve.5Measurementsoundguys.com/anker-soundcore-aerofit-2-review-126119Read 13 October 2026Measured against the SoundGuys preference curve in the SoundGuys lab, from the product page data points.6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026Lab data points on the product page, SoundGuys preference curve.

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

Clear voices in ideal conditions. Not especially good at rejecting background noise in the simulated office test. Voices stay audible in the windy test.5Measurementsoundguys.com/anker-soundcore-aerofit-2-review-126119Read 13 October 2026Demo recordings in ideal, office, street, windy and reverberant conditions. Firmware 1.42 and app 3.7.3.

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.

Not available

Not available

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

Not available

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.

43Maker product pageankerjapan.com/products/a3874Read 13 October 2026Call noise reduction listed as 4 mic and AI.6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026

Not available

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.

Not available

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

AI3Maker product pageankerjapan.com/products/a3874Read 13 October 2026

DSP1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Call noise cancellation: ENC call noise reduction. Read as digital signal processing, since no AI is named.

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

5 of 18 differ

Chip

Not available

Not available

Connections

Bluetooth3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Bluetooth 5.4 only.

Bluetooth1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Bluetooth is the only connection named.

Bluetooth

5.43Maker product pageankerjapan.com/products/a3874Read 13 October 20264Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

5.41Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs and feature text: Bluetooth 5.4. The Oct 2024 Tech Outlook review and the Feb 2025 Gadgeteer spec table both say Bluetooth 5.3. The current maker pages and retailer titles say 5.4.

Bluetooth codecs

SBC, AAC, LDAC1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026LDAC is named on the maker page. SBC and AAC come from the Anker Japan page.3Maker product pageankerjapan.com/products/a3874Read 13 October 2026Comparison table lists SBC, AAC and LDAC.

AAC, SBC1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Audio codec: AAC/SBC.

Bluetooth profiles

Not available

Not available

LE Audio

Not available

Not available

Auracast

Not available

Not available

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

Yes3Maker product pageankerjapan.com/products/a3874Read 13 October 2026

Not available

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

23Maker product pageankerjapan.com/products/a3874Read 13 October 2026Connects to 2 devices at the same time.6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026

Not available

Multipoint with LDACiMany buds turn multipoint off on LDAC

No7Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026Enabling LDAC gives up multipoint connectivity.

Not available

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

Not available

Not available

Automatic switching between own devicesiThrough the maker's account

Not available

Not available

Fast pairing

Not available

Not available

Audio sharingiShare one stream with a second pair

Not available

Not available

Wireless range (claimed)

Not available

15m1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Effective Bluetooth range: 15m. The Amazon listing item details say 20 meters. The maker page value is stored.

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

1 of 3 differ

Low latency mode

Yes8Reviewmezha.ua/en/reviews/oglyad-anker-soundcore-aerofit-2-301914Read 13 October 2026The app main screen offers a Gaming Mode described as a low latency mode.

Not available

Claimed latency

Not available

Not available

Lowest claimed latency

Not available

Not available

Compatibility

None of 4 known

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

Not available

Not available

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.

Not available

Not available

Official licence

Not available

Not available

Battery and charging

7 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

60mAh1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Battery capacity: 60mAh (earphones). Rated capacity.

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.

Not available

Not available

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.

Asoundcore AeroFit 2

Mode	Includes case recharges	Hours (h)
ANC off	No	10
ANC off	Yes	42

Source1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026Up to 10 hours on a single charge and up to 42 hours with the case. The UK store page states a total of 35 hours with the case.3Maker product pageankerjapan.com/products/a3874Read 13 October 202610 hours for the earbuds alone and 42 hours with the charging case.

BTOZO Open EarRing

Mode	Codec	Includes case recharges	Hours (h)
ANC off	AAC	No	10
ANC off	AAC	Yes	40

Source1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs: music play time (AAC, default setting, 50% volume) 10h on a single charge and 40h with the charging case. The case total counts the earbuds plus case recharges. No ANC. The Gadgeteer says the case adds 30 h.7Maker product pagetozostore.com/blogs/news/tozo-openwear-vs-tozo-open-earring-which-open-ear-fits-you-bestRead 20 October 2026Maker comparison table: single charge playtime 10 hours and total playtime 40 hours.

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.

10h=CalculatedFrom Claimed battery life

10h=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

Not available

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

10h=CalculatedFrom Claimed battery life

10h=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.

42h=CalculatedFrom Claimed battery life

40h=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

Not available

Talk time (claimed)

Not available

Not available

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.

60min4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026Earbuds charge within 1 hour. Stored as 60 minutes.

90min1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Cable charge time: 1.5h (earphones). Stored as 90 minutes. The maker labels it for the earphones and does not state the endpoints.

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.

Earbuds charge within 1 hour. The case and earbuds together take about 2.2 hours by USB-C cable and about 2.6 hours on a wireless charger. Input is 5 V 1.2 A.4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026Case and earbuds about 2.2 hours by cable and 2.6 hours wireless in the French and Danish guides. Input 5 V 1.2 A.

Not available

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

10min3Maker product pageankerjapan.com/products/a3874Read 13 October 202610 minutes of charging gives up to 4 hours of playback.

Not available

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.

4h3Maker product pageankerjapan.com/products/a3874Read 13 October 2026

Not available

Charging case

4 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.

750mAh4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026Specifications page lists battery capacity 750 mAh. This is the charging case battery.

400mAh1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Battery capacity: 400mAh (charging case). Rated capacity.

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.

Not available

Not available

Case charging port

USB-C4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026USB-C charging port on the case.

USB-C1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Charging port: USB Type C.

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.

102min4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026Case charge time about 1.7 hours by USB-C cable. Stored as 102 minutes.

120min1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Cable charge time: 2h (charging case). Stored as 120 minutes.

Wireless charging

Yes1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026Place the case on a wireless charger to recharge.

No8Reviewthe-gadgeteer.comRead 20 October 2026Review of 2025-02-19 lists Add wireless charging under what needs to be improved, so the case has none.

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

Not available

Not available

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

Yes1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Page: the smart LED display on the charging case shows real-time battery status.

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.

Touch3Maker product pageankerjapan.com/products/a3874Read 13 October 2026

Touch8Reviewthe-gadgeteer.comRead 20 October 2026Review: touch controls on the larger bulb behind the ear.

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

Touch7Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026Volume gestures can be assigned in the app. They are not set by default.

Touch9Reviewthetechoutlook.com/reviews/gadgets-reviews/tozo-open-earring-review-affordable-and-comfortable-to-wear-all-day-longRead 20 October 2026Review: the touch controls cover playback, volume up and down, answering and rejecting calls. They are customisable in the app.

Gestures

Right double tap: play or pause, Left double tap: next track, Double tap during a call: answer, Hold for 2 seconds during a call: reject or end4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026Default touch controls in the guide. Other actions are set in the soundcore app.

Double tap either earbud: play or pause, Triple tap the left earbud: previous track, Triple tap the right earbud: next track, Double tap either earbud: answer a call, Double tap and hold either earbud: hang up a call, Triple tap either earbud: reject a call, Tap once, then hold for 2 seconds: voice assistant2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Sections 5.1 to 5.3. Defaults with both earbuds worn. The manual lists no volume gesture and the Gadgeteer review of 2025-02-19 says functions are assigned in the app, so these are the default assignments. Power on is a 3 second hold and power off is a tap and an 8 second hold.

Remappable controls

Yes4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 20267Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026

Yes2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Section 7.0: most of the controls can be customized in the app.8Reviewthe-gadgeteer.comRead 20 October 2026Review: in the app you can assign functions to each tap sequence for the left and right buds.9Reviewthetechoutlook.com/reviews/gadgets-reviews/tozo-open-earring-review-affordable-and-comfortable-to-wear-all-day-longRead 20 October 2026Review: the touch controls can be customised via the TOZO app.

Voice assistant

Not available

Voice assistant2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Section 5.3: tap once, then press and hold for 2 seconds. No assistant is named.

Sensors and health

1 of 9 differ

In-ear detection

No6Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026Auto pause is listed as No.

Not available

Sensors

Not available

Not available

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

2 of 7 differ

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.

Ear hook1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 20263Maker product pageankerjapan.com/products/a3874Read 13 October 2026Ear hook angle adjustable in 4 steps.

Not available

Ear tip fit test

Not available

Not available

Dust and water rating, buds

IP553Maker product pageankerjapan.com/products/a3874Read 13 October 20264Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

IPX51Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Water resistance - earphone: IPX5.7Maker product pagetozostore.com/blogs/news/tozo-openwear-vs-tozo-open-earring-which-open-ear-fits-you-bestRead 20 October 2026Maker comparison table: IPX5.

Dust and water rating, case

Not available

Not available

Water resistance depth

Not available

Not available

Software

3 of 6 differ

Companion app

soundcore4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

TOZO app1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Feature text: the TOZO app has 32 preset EQs and 2,000+ personalised EQs shared by other users.8Reviewthe-gadgeteer.comRead 20 October 2026Review: the app customises EQ settings, assigns touch controls and shows the battery of the buds.

App platforms

Android, iOS4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 20266Spec databasesoundguys.com/product/soundcore-aerofit-2Read 13 October 2026

iOS, Android2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Section 8.0 shows the App Store and Google Play badges.8Reviewthe-gadgeteer.comRead 20 October 2026Review: the app is available in the Play Store and the App Store.

User firmware updates

Yes4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

Yes2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Section 7.0: the earbuds firmware can be updated in the app.9Reviewthetechoutlook.com/reviews/gadgets-reviews/tozo-open-earring-review-affordable-and-comfortable-to-wear-all-day-longRead 20 October 2026Review of 2024-10-27: the app settings check for OTA updates and the reviewer installed one for the Open EarRing.

Finding network

Not available

Not available

Precision findingiUWB in the case

Not available

Not available

Live translation

Yes1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026AI translation for 100 languages in the soundcore app, with the app and firmware updated.

Not available

Dimensions and weight

2 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.

Not available

5.1g(0.2 oz)1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Tech specs Weight (each ear): 5.1g (+/-0.2g). One FAQ answer says 5.6 g, which the Open Rhyme page also says, so the spec table value is used.

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

Not available

Not available

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

65g(2.3 oz)5Measurementsoundguys.com/anker-soundcore-aerofit-2-review-126119Read 13 October 2026Spec table lists case weight 65 g. Digital Trends also lists 65 g for the charging case.7Reviewdigitaltrends.com/home-theater/soundcore-aerofit-2-reviewRead 13 October 2026Weight listed as 65 g for the charging case.

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.

Not available

Not available

Certifications

1 of 3 differ

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

Not available

Not available

Communication certifications

Not available

FCC Part 15, ISED licence-exempt RSS, CE RED 2014/53/EU2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Sections 10.0 to 12.0: FCC Part 15 statement, ISED licence-exempt RSS statement and CE-DOC under Directive 2014/53/EU. No ID is printed.

FCC IDs

Not available

Not available

Other certifications

Not available

Not available

In the box

2 of 2 differ

In the box

Earbuds, Charging case, USB-C charging cable, Quick guide with a QR code for the app8Reviewmezha.ua/en/reviews/oglyad-anker-soundcore-aerofit-2-301914Read 13 October 2026The package has a charging case with the earbuds, a USB Type-C charging cable and a short instruction sheet with a QR code for the app.

Open EarRing earbuds, Charging case, User manual and quick guide, USB-C (A to C) cable, 20 inches1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026What's in the box: Open EarRing Earbuds, Wireless Charging Case (a case for the wireless earbuds, since the case has no wireless charging), User Manual and Quick Guide, USB-C (A to C) cable (20 inch).

Cables included

Asoundcore AeroFit 2

Type	Count
USB-C charging cable	1

Source8Reviewmezha.ua/en/reviews/oglyad-anker-soundcore-aerofit-2-301914Read 13 October 2026USB Type-C charging cable. The length is not stated.

BTOZO Open EarRing

Type	Length (m)	Count
USB-A to USB-C	0.508	1

Source1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026What's in the box: USB-C (A to C) cable, 20 inches. Stored as the exact conversion of 20 in to 0.508 m.

Links

Not compared

Product page

us.soundcore.com/products/a3874-aerofit-2-open-earbuds1Maker product pageus.soundcore.com/products/a3874-aerofit-2-open-earbudsRead 13 October 2026

www.tozostore.com/products/openearring-headphone1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026TOZO official store page for the Open EarRing. TOZO also sells the OpenWear, Open Buds and Open X2 Pro. They are separate products.

Spec sheet

Not available

Not available

Manual

lp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdf4Owner's manuallp.ankerjapan.com/hubfs/aoos/manual/A3874Manual.pdfRead 13 October 2026

m.media-amazon.com/images/I/C1sUN0sgNdL.pdf2Owner's manualm.media-amazon.com/images/I/C1sUN0sgNdL.pdfRead 21 October 2026Open EarRing user manual, English section (PDF created 2025-12-17, 12 pages). Linked from the TOZO brand listing on Amazon. The text of the PDF is outlined, so it was read from page images. The TOZO manuals page does not list the Open EarRing.

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.

Not available

1year1Maker product pagetozostore.com/products/openearring-headphoneRead 20 October 2026Store banner: 12+6 months hassle-free warranty. The TOZO warranty policy page states a one-year limited warranty, so the 12-month base term is stored. The earlier value of 1.5 years counted the banner extension. Stored for the TOZO US store.3Maker product pagetozostore.com/pages/warranty-policyRead 21 October 2026TOZO US warranty policy: one-year limited warranty against manufacturing defects from the date of purchase for all authentic products.

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