Earbuds / Compare

Bose QuietComfort Ultra Earbuds vs Sony LinkBuds Fit

A

Product A: Bose

QuietComfort Ultra Earbuds

83 of 166 known

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B

Product B: Sony

LinkBuds Fit

84 of 166 known

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All 166 fields

Every value links to where we found it.

Only differences

ABose QuietComfort Ultra Earbuds

BSony LinkBuds Fit

General

6 of 8 differ

Series

QuietComfort1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026

LinkBuds1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 2026

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

441408, 408L, 408R, 882826-00105Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Regulatory page 6: Case Model 441408, Right Earbud Model 408R, Left Earbud Model 408L. The 2nd Gen owner's guide lists the same earbud models with case model 444965.14Retailer pageconrad.be/nl/p/bose-quietcomfort-ultra-earbuds-in-ear-oordopjes-zwart-oplaadbox-waterafstotend-3334481.htmlRead 7 October 2026Adds exact Black retail manufacturer SKU 882826-0010 from product header. Original case regulatory model 441408 and earbud regulatory models 408L/408R remain separate. No second-generation 444965 case added.

WF-LS910N, YY29753Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

GTIN / EAN

001781784768114Retailer pageconrad.be/nl/p/bose-quietcomfort-ultra-earbuds-in-ear-oordopjes-zwart-oplaadbox-waterafstotend-3334481.htmlRead 7 October 2026Exact current Conrad Belgium Black Gen. 1 table identifies EAN 0017817847681 and manufacturer SKU 882826-0010. Independently opened actual public table. Netherlands route was shell-only in verification. Black original stock case scope, not every color or second generation.

Not available

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

14 September 20236Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Dated September 14, 2023

1 October 20245Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 2026October 1 opens preorder. Actual October retail month independently established below.

Status

Available1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Product heading, colour swatches, £299.95 price and Add to Basket. The German and French pages also list it at 299,95 €. New stock on bose.com US is gone and only refurbished units remain there.

Not available

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

Bose QuietComfort Earbuds II21Reviewsoundguys.com/bose-quietcomfort-ultra-earphones-vs-bose-quietcomfort-earphones-ii-102644Read 23 October 2026SoundGuys calls the QuietComfort Ultra Earbuds a direct successor to the QuietComfort Earbuds II.

Sony LinkBuds S15Reviewm.gsmarena.com/sony_unveils_linkbuds_open_with_open_design_linkbuds_fit_replace_the_linkbuds_s-amp-64762.phpRead 23 October 2026GSMArena says the LinkBuds Fit replaces the LinkBuds S and calls it the sequel to the LinkBuds S.16Reviewtomsguide.com/audio/sony-revives-linkbuds-series-with-a-focus-on-style-and-fit-can-they-beat-boseRead 23 October 2026Tom's Guide says the LinkBuds Fit takes over for the LinkBuds S.

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.

Bose QuietComfort Ultra Earbuds (2nd Gen)7Press releasebose.com/pressroom/bose-announces-the-quietcomfort-ultra-earbuds-2nd-genRead 6 October 2026The 2nd Gen release says: Like its predecessor, the QC Ultra Earbuds feature Bose's proprietary CustomTune sound calibration technology.

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.

$2994Maker product pagebose.com/p/refurbished/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN-FR.htmlRead 6 October 2026Bose refurbished page: Original Price is $299.00. TechRadar and What Hi-Fi also give $299 at launch.8Press articletheverge.com/2023/9/14/23873671/bose-quietcomfort-ultra-headphones-earbuds-announcedRead 6 October 2026$299, available early October. Preorders opened September 14, 2023.

$199.995Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 2026Original maker launch MSRP 199.99 USD. Later SoundGuys commerce widget 229.99 USD is excluded. Before US local sales tax. EUR VAT scope unproved.

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, GB, DE, FR1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026GB from this page. DE and FR from bose.de and bose.fr pages of the same product. US from the bose.com refurbished page and the launch coverage.2Maker product pagebose.de/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 6 October 2026Listed at 299,95 €3Maker product pagebose.fr/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 6 October 20264Maker product pagebose.com/p/refurbished/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN-FR.htmlRead 6 October 2026

GB, US, JP2Maker product pagesony.co.uk/headphones/products/linkbuds-fitRead 5 October 2026This exact UK page establishes GB. US launch and Japanese product pages separately establish their own markets.5Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 20266Maker product pagesony.jp/headphone/products/LinkBuds_FitRead 5 October 2026

ColoursiThe maker's own colour names

Black, White Smoke, Lunar Blue, Moonstone Blue1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Colour swatches on the UK page: Lunar Blue (SKU QCUE-HEADPHONEIN-LBLU-WW) and White Smoke selectable, Moonstone Blue shown as out of stock4Maker product pagebose.com/p/refurbished/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN-FR.htmlRead 6 October 2026Refurbished colour swatches: Black (SKU QCUE-HEADPHONEIN-BLK-FR-WW), Lunar Blue, Moonstone Blue, White Smoke8Press articletheverge.com/2023/9/14/23873671/bose-quietcomfort-ultra-headphones-earbuds-announcedRead 6 October 2026The QC Ultra Earbuds come in black or white finishes9Reviewtomsguide.com/reviews/bose-quietcomfort-ultra-earbudsRead 6 October 2026Two color variations at launch: black and white smoke

Black, White, Green, Pink, Violet5Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 2026Original US maker launch lists Black, White, Green and US-only Violet Olivia edition. Separately sold accessory-cover colours are not earbud finishes.6Maker product pagesony.jp/headphone/products/LinkBuds_FitRead 5 October 2026Japanese current product lists base finishes including later Pink. Original US maker release separately proves US Violet Olivia edition.

Segment

Music1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Maker explicitly positions these as music-listening in-ear earbuds with immersive audio, musical listening modes and customizable sound. Gaming codec capability does not make them a dedicated gaming edition.

Music2Maker product pagesony.co.uk/headphones/products/linkbuds-fitRead 5 October 2026

Design

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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.

In-ear1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Technical Specifications: Headphone Fit In-ear

In-ear2Maker product pagesony.co.uk/headphones/products/linkbuds-fitRead 5 October 2026

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

Stem10Reviewtechradar.com/audio/headphones/earbuds-airpods/bose-quietcomfort-ultra-earbuds-reviewRead 6 October 2026Describes the outer-facing surface of the stems and earbuds with tails

Stemless2Maker product pagesony.co.uk/headphones/products/linkbuds-fitRead 5 October 2026

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

Either bud1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: the Single-bud Use feature lets you take calls and listen to music with one bud and switches automatically between the earbuds

Either bud3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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.

ABose QuietComfort Ultra Earbuds

Not available

BSony LinkBuds Fit

Type	Diameter (mm)
Dynamic	8.4

Source8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Exact LinkBuds Fit section explicitly 8.4 mm Dynamic DriverX, not borrowed merely because the page mentions WF1000XM5. Existing dynamic technology retained, no guessed dome/edge material or count.13Maker product pagesony.jp/headphone/products/LinkBuds_Fit/spec.htmlRead 8 October 2026Exact model specification lists 8.4 mm driver unit. Per-bud transducer count is not explicitly stated and is not inferred.

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

Dynamic18Reviewwhathifi.com/headphones/wireless-earbuds/bose-quietcomfort-ultra-earbuds-2nd-genRead 7 October 2026What Hi-Fi exact Gen 2 review Sound paragraph explicitly reports Bose confirmed the driver is the same between new and old Ultra Earbuds. This manufacturer hardware bridge supports first-generation driver technology using the reliable exact Gen2 dynamic-driver table. No tuning, measurements, new case or disputed diameter transferred. Main approved the unchanged-component chain.19Reviewtechradar.com/audio/earbuds-airpods/bose-quietcomfort-ultra-earbuds-2nd-gen-reviewRead 7 October 2026Exact second-generation review Specifications explicitly states dynamic driver technology. What Hi-Fi separately reports Bose confirmed the same driver in Gen 1 and Gen 2, establishing applicability to retained original 2023 earbuds. Only technology transferred under this explicit manufacturer bridge. Its 9.3 mm versus 10 mm inconsistent diameter statements are omitted, along with all successor measurements and case features.

Dynamic8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Exact named Dynamic Driver X 8.4 mm. Diaphragm combines different dome/edge materials, whose chemical identities are not published.

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

Not available

8.4mm=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.

Not available

Not available

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.

Not available

Not available

Impedance

Not available

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

96kHz13Maker product pagesony.jp/headphone/products/LinkBuds_Fit/spec.htmlRead 8 October 2026Exact model A2DP transmission specification explicitly LDAC 96 kHz sampling at 990 kbps. Highest documented supported source condition. 20 Hz to 40 kHz is A2DP transmission bandwidth, not stored as acoustic response.

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

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026CustomTune technology paragraph explicitly analyzes ear shape and calibrates audio to each ear canal. This is acoustic ear-scan personalization, not a hearing assessment or medical hearing-aid claim.

Yes8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026

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.

31Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Bose app section: adjust the levels of bass, mid-range and treble. The battery footnote also names a 3-band EQ.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Battery footnotes use a 3-band EQ set to zero

59Reviewwhathifi.com/reviews/sony-linkbuds-fitRead 5 October 2026Exact review Features states five custom EQ bands. App/firmware version unknown. CLEAR BASS separately controlled.

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

Bass Boost, Bass Reducer, Treble Boost, Treble Reducer12Reviewsoundguys.com/bose-quietcomfort-ultra-earbuds-review-101362Read 7 October 2026Original 2023 review What do the different EQ modes sound like section explicitly names these four stock presets. Its Our Custom EQ attempt is reviewer-created and excluded.

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 Audio1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Bose Immersive Audio works with any source and content

360 Reality Audio8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Compatible 360 Reality Audio streaming service, content and Sound Connect ear-shape analysis required. DSEE 96 kHz/24 bit upscaling is not accepted input resolution and is omitted from max digital input fields.

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

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 31: Motion keeps the two virtual speakers following your head. Still keeps them in place when you move your head.6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Immersive Audio uses an onboard IMU. Still and Motion options.

Yes9Reviewwhathifi.com/reviews/sony-linkbuds-fitRead 5 October 2026Exact review Features explicitly supports head tracking. Compatible phone/content/app required, without claiming universal iOS tracking.

Noise cancelling

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Active noise cancelling

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026

Yes8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026

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

Hybrid1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: active noise cancellation uses microphones both inside and outside the earbuds

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.

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026CustomTune analyses your ears and automatically adapts the sound and active noise cancellation to their shape

Yes8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Auto NC Optimizer explicitly detects wearing fit and environment and continuously optimizes cancellation. This is separate from activity-based switching.

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

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 20268Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026

Adjustable transparency

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Modes for any musical moment says full Aware transparency can be blended with Quiet through Custom Mode in Bose app. FAQ also permits intermediate sound levels between Quiet and Aware. No ANC step count inferred.

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Pages 100-101 and app page 124 document changing ambient capture and Auto Ambient Sound sensitivity.8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Manual page 101 auto-adjusts ambient capture in ambient mode. This does not establish an ANC/transparency blend, so adaptive_audio_mode omitted.

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

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 33: Aware mode with ActiveSense automatically increases noise cancellation when sudden or loud noises occur while you keep hearing your surroundings

Not available

Conversation detection

Not available

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Speak-to-Chat automatically pauses/mutes music when wearer speaks. Does not imply a medical hearing feature.

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

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Call processing, not an ANC mode: FAQ says the adaptive microphone system isolates your voice from background noise and wind6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Dynamic microphone mixing picks the microphone on each bud with the least wind noise and selects noise filters for calls

Yes8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Physical wind reduction structure around mic. No selectable wind-processing mode assumed.

Measured

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

Warm sound signature13Measurementrtings.com/headphones/reviews/bose/quietcomfort-ultra-earbuds-truly-wirelessRead 6 October 2026Sound Signature: Warm

Lab response has emphasized bass, a dip in low mids and uneven highs against the reviewer preference curve.11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Exact lab commentary. No graph extraction, ratings or MOS converted into dB.12Measurementsoundguys.com/how-we-testRead 5 October 2026Bruel & Kjaer 5128 fixture, SoundCheck and source preference curve.

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.

4dB13Measurementrtings.com/headphones/reviews/bose/quietcomfort-ultra-earbuds-truly-wirelessRead 6 October 2026Bass Amount: Emphasized (4 dB), test bench 2.3

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.

0dB13Measurementrtings.com/headphones/reviews/bose/quietcomfort-ultra-earbuds-truly-wirelessRead 6 October 2026Treble Amount: Balanced (0 dB), test bench 2.3

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

In controlled phone-call tests, transmitted speech retained substantial simulated cabin noise. Simulated restaurant noise was only partly suppressed.16Measurementtechadvisor.com/article/2117356/bose-quietcomfort-ultra-headphones-review-2023.htmlRead 7 October 2026October 26, 2023 comparison explicitly includes original QC Ultra Earbuds alongside two over-ear models. Reviewer called a home answering machine from smartphone while playing cabin noise at 85 dB on Sonos Era 100, then restaurant noise at 75 dB. Earbud-specific result is retained, not over-ear result. Phone/codec, firmware, weighting and mic distance unstated. Qualitative call finding, no scalar noise ratio inferred.

Standardized recordings show problems with street noise and reverberation, while wind was handled better.11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Exact recorded ideal/office/street/wind/reverberant speech samples. No numerical capsule count inferred.12Measurementsoundguys.com/how-we-testRead 5 October 2026Calibrated artificial mouth with simulated noise, wind and reverberation.

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 QuietComfort Ultra Earbuds

Hours (h)
6.18

Source12Reviewsoundguys.com/bose-quietcomfort-ultra-earbuds-review-101362Read 7 October 20266 h 11 min (6.18 h) in the SoundGuys standardized battery test. Firmware 7.7.4, Bose Music app 8.0.6. ANC state not stated on the page.

BSony LinkBuds Fit

Hours (h)
6.77

Source11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Own standardized rundown 6 h 46 min (existing row retained). Exact review unit WFLS910NB.UC, firmware 1.2.0 and Sound Connect 11.0.2. Runtime paragraph does not specify ANC, codec or exact host, so no flags inferred from its iPhone/computer discussion. LC3 extension is explicitly untested and omitted.12Measurementsoundguys.com/how-we-testRead 5 October 2026Standardized continuous music peaks 75 dB SPL. This does not establish an unstated ANC/codec for a particular sample.

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

6.18h=CalculatedFrom Battery life (measured)

6.77h=CalculatedFrom Battery life (measured)

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

4 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.

817Reviewon-mag.fr/index.php/topaudio/tests-auditions/25606-test-bose-quietcomfort-ultra-earbuds-des-ecouteurs-true-wireless-excellents-partout-ou-presqueRead 7 October 2026Same exact original 2023 Specifications explicitly says four microphones per side in calls. Eight across both earbuds. Source explicitly names call role, rather than deriving role from existing eight-total count. ANC-only count remains unproved. No second-generation speech vibration sensor inherited.

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.

810Reviewtechradar.com/audio/headphones/earbuds-airpods/bose-quietcomfort-ultra-earbuds-reviewRead 6 October 2026A four-mics-per-bud array, so eight across the pair. The 2nd Gen press release also states eight microphones.

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

DSP6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Dynamic microphone mixing and adaptive filters select from a variety of noise filters in real time. No AI processing is named. The 2nd Gen added AI-powered noise suppression.

AI7Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_4.htmlRead 5 October 2026Exact model maker call paragraph explicitly AI-trained separation of wearer voice and environmental noise. Published physical voice/total capsule counts not found. Internal microphone is expressly used for calls, so exterior diagram alone is incomplete.

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

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: self-voice, adjustable in the Bose app, lets you hear yourself during calls5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 30: self voice is activated during calls and is adjustable in the Bose app

Not available

Connectivity

8 of 18 differ

Chip

Qualcomm S517Reviewon-mag.fr/index.php/topaudio/tests-auditions/25606-test-bose-quietcomfort-ultra-earbuds-des-ecouteurs-true-wireless-excellents-partout-ou-presqueRead 7 October 2026November 11, 2023 exact original-earbud review Specifications explicitly names Puce Bluetooth 5.3 Qualcomm S5. Independently read full original article via normal public HTTP 200 during verification. No S5 generation or exact QCC silicon part number inferred from successor/predecessor.

Sony Integrated Processor V25Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 2026Exact product launch explicitly names Integrated Processor V2 in this model, not inferred from sibling hardware.

Connections

Bluetooth1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026

Bluetooth3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Bluetooth

5.34Maker product pagebose.com/p/refurbished/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN-FR.htmlRead 6 October 2026Technical Specifications: Bluetooth Version 5.36Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Both QC Ultra products are Bluetooth 5.3 compatible

5.31Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 20263Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Original exact manual printed pages 153-154 explicitly publish Bluetooth 5.3, named codecs and profiles.

Bluetooth codecs

SBC, AAC, aptX Adaptive5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 47: aptX Adaptive with Snapdragon Sound-certified devices6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 202612Reviewsoundguys.com/bose-quietcomfort-ultra-earbuds-review-101362Read 7 October 2026Bluetooth 5.3 over SBC, AAC or aptX Adaptive

SBC, AAC, LDAC, LC31Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 2026LC3 needs compatible LE Audio Android hardware and app setup. Fit LDAC uses Classic Audio. No Auracast inferred from LC3 or Bluetooth 5.3.3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Bluetooth profiles

A2DP, HFP, AVRCP1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Technical Specifications: Wireless Connectivity A2DP Bluetooth Audio Streaming, HFP Bluetooth, Snapdragon Sound15Maker product pagesupport.bose.com/article/quietcomfort-ultra-earbuds-specificationsRead 7 October 2026Official original Sold from 2023 support Specifications lists Audio/Video Remote Control Profile AVRCP, alongside A2DP/HFP. Existing A2DP/HFP retained. Listed Bluetooth Low Energy BLE is a radio/control transport, so it is not used to assert LE Audio content support or stored as an audio profile.

A2DP, AVRCP, HFP, HSP, TMAP, CSIP, MCP, VCP, CCP1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 20263Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

LE Audio

Not available

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Auracast

Not available

Not available

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

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: connects to two source devices at the same time. Added by a software update in July 2024. Not available at launch.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 42: up to two mobile devices actively connected at a time (multi-point connection). Audio plays from one device at a time.

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Two concurrent sources in Classic Audio, one playing stream. App list marks multipoint unavailable during LE Audio. No simultaneous LC3 multipoint claim.

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

21Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: two source devices at the same time5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026

23Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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.

65Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 42: up to six devices in the earbud device list

83Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Automatic switching between own devicesiThrough the maker's account

Not available

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Printed page 85 explicitly Google audio switch on compatible Android 8+ devices, using Fast Pair. Separate from Sony Auto Switch to LinkBuds Speaker.

Fast pairing

Google Fast Pair1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: Google Fast Pair for Android OS 6.0 or newer5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 46: Fast Pair for Android devices6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026

Google Fast Pair, Microsoft Swift Pair3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Android Google audio switch chapter explicitly requires Google Fast Pair. Windows 10/11 chapters explicitly document Microsoft Swift Pair.

Audio sharingiShare one stream with a second pair

Not available

Not available

Wireless range (claimed)

9m4Maker product pagebose.com/p/refurbished/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN-FR.htmlRead 6 October 2026Technical Specifications: Bluetooth Range 30'5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 43: devices must be within range (30 ft or 9 m)

10m1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 20263Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Manual explicitly approximate line-of-sight 10 m. Obstacles, interference, antenna, reception and software conditions affect actual range.

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

None of 3 known

Low latency mode

Not available

Not available

Claimed latency

Not available

Not available

Lowest claimed latency

Not available

Not available

Compatibility

3 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, iOS1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Bose app available on Google Play and the Apple App Store

Android, iOS, Windows, macOS3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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.

ABose QuietComfort Ultra Earbuds

Not available

BSony LinkBuds Fit

Platform	Connection	Microphone works
Android	Bluetooth	Yes
iOS	Bluetooth	Yes
Windows	Bluetooth	Yes
macOS	Bluetooth	Yes

Source3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Exact Android/iPhone/Windows/Mac pairing chapters and computer calls chapter. Classic phone/desktop calls need compatible HFP/HSP app settings. LE Audio availability is separately restricted.

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

ABose QuietComfort Ultra Earbuds

Feature	Needs
Fast Pair	Android device running Android 6.0 or higher
Snapdragon Sound	Snapdragon Sound-certified device, such as a compatible Android mobile device
SimpleSync	Bose Smart Speaker or Bose Smart Soundbar
Multipoint	Earbud software update from July 2024 through the Bose app

Source1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Multipoint row: FAQ says multipoint is a July 2024 update received through the Bose app. Fast Pair row also needs location services and Bluetooth on.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Fast Pair needs Android 6.0 or higher (page 46). Snapdragon Sound needs a certified device (page 47). SimpleSync works with Bose Smart Speakers and Soundbars (page 48).

BSony LinkBuds Fit

Feature	Needs
LE Audio / LC3	Compatible Android smartphone and Sound Connect LE Audio setup. Classic-only multipoint, Quick Access and some voice-assistant functions become unavailable.
Google audio switch	Compatible Android 8 or later devices connected through Google Fast Pair.
Head tracking	Android 13+ head-tracking-compatible phone. 360 Reality Audio head tracking also requires certified phone and compatible 360 content. Amazon Music is excluded. Android multichannel head tracking depends on supported app/content. Xperia 1 V multichannel playback is limited to YouTube as stated by maker.
LDAC high-resolution playback	LDAC-compatible source and Sony Sound Connect setup. Maker specifies 96 kHz sampling at 990 kbps for published A2DP bandwidth. High-resolution streaming also requires Android 10+ compatible player. This is not lossless playback or an acoustic frequency-response claim.
DSEE Extreme	Enable in Sony Sound Connect. Maker describes upsampling compressed CD/MP3 material up to 96 kHz/24-bit with SBC/AAC/LDAC. This does not establish incoming source bit depth, so no max_bit_depth_bits inferred.

Source3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Exact manual Classic/LE Audio and Google audio switch conditions. Spatial phone/content requirements independently retained in the source describing tracking.8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Exact head-tracking requirements: Android 13+, compatible phone/content/app, Amazon Music excluded for 360 Reality Audio. DSEE Extreme 96/24 is upsampling and not incoming source capability.

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

Not available

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

No14Owner's manualbhphotovideo.com/lit_files/1165249.pdfRead 8 October 2026Original reference guide page 1 explicitly non-replaceable button/coin cells and identifies Z35FH. This supports the earbud coin-cell flag only. The charging case battery replacement flag remains unknown, not inferred from recycling instructions.

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 QuietComfort Ultra Earbuds

Mode	Spatial audio	Includes case recharges	Hours (h)
ANC on	No	No	6
ANC on	Yes	No	4

Source20Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 8 October 2026The exact manufacturer guide on printed page 39 gives up to 6 hours with Bose Immersive Audio Off and up to 4 hours with it On after a full charge. Both music rows use Quiet Mode with full active noise cancellation, Bluetooth A2DP streaming at 75 dB SPL playback loudness, and all three equalizer bands at zero. Manufacturer testing used production-representative units in June 2023 with a variety of music tracks. The Bluetooth codec and Immersive Still/Motion setting are unspecified, so neither is inferred. These are manufacturer claims, not independent reviewer measurements. Both rows are the earbuds alone from one charge. The case provides three additional full recharge cycles, but a total hour figure is not calculated.

BSony LinkBuds Fit

Mode	Codec	Includes case recharges	Hours (h)
ANC on	LDAC	No	3.5
Transparency	LDAC	No	3.5
ANC off	LDAC	No	4.5
ANC on	AAC	No	5.5
Transparency	AAC	No	5.5
ANC off	AAC	No	8
ANC on	SBC	No	5
Transparency	SBC	No	5
ANC off	SBC	No	7.5
ANC on	LC3	No	4.5
Transparency	LC3	No	4.5
ANC off	LC3	No	7.5
Call	Not available	No	4
ANC on	Not available	Yes	21

Source4Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Exact page 28 codec/mode runtime table. EQ, DSEE Extreme, Speak-to-Chat, voice wake, Service Link and Auto Ambient Sound shorten runtime. Call 4h is ANC on/off. Transparency-call 3.5 h does not fit call enum and is omitted.5Press releasesony.mediaroom.com/2024-10-01-Sony-Electronics-Expands-its-LinkBuds-Range-with-the-LinkBuds-Fit-and-LinkBuds-Open-Earbuds,-and-LinkBuds-SpeakerRead 5 October 2026Body explicitly 21 h including case. Footnote 9 specifies noise cancellation and Bluetooth. Recharge-count marketing is not multiplied into a different total. Codec unstated.

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.

6h=CalculatedFrom Claimed battery life

8h=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.

6h=CalculatedFrom Claimed battery life

5.5h=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.

Not available

8h=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

21h=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

21h=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.

120min1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Technical Specifications: Battery Charge Time 2 hours5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 39 charging time table: Earbuds up to 2 hours

120min3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Approximate earbuds-only full charge in case. Case-only charging is separately published.

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.

Not available

Not available

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

20min5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 39: a 20-minute charge in the closed case powers the earbuds up to 2 hours

5min3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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.

2h5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Earbuds-only playback. Quiet Mode, Immersive Audio off, 75 dB SPL, 3-band EQ zero.

1h3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Maker approximately one hour of earbud music after five-minute charging. Codec/volume unspecified for this quick-charge claim. Excludes case-inclusive runtime.

Charging case

1 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.

Not available

Not available

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-C1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Technical Specifications: Charging Interface(s) USB-C PORT

USB-C3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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.

180min5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 39 charging time table: Charging case up to 3 hours

180min3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Wireless charging

No6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026The case has no built-in wireless charging. An optional $49 silicone case cover, sold separately from October 20, 2023, adds it.

No11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Exact charging paragraph explicitly USB-only and no wireless charging. Fit FAQ footer says Yes, contradicting its body. Primary maker table/manual only publish USB charging. Detailed tested body takes precedence over generic footer.

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

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

No11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Exact-model review feature assessment explicitly No transmitter in case. Review unit WFLS910NB.UC, firmware 1.2.0 and Sound Connect 11.0.2. This negative capability is not inferred from a port photo.

Controls

4 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.

Touch, Swipe1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ controls: swipe up or down for volume, tap, double tap, triple tap, press and hold for the shortcut5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Pages 24 to 27: tap and swipe the touch surface, touch and hold for the shortcut

Touch, Head gestures, Voice commands3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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

Swipe1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 20265Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 24: swipe up or down on an earbud

Touch3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Gestures

Tap, Double-tap, Triple-tap, Touch and hold, Swipe up, Swipe down1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ controls list. Names as in the owner's guide.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Pages 24 to 28

Wide Area Tap on earbud or nearby skin, Head nod to accept a call, Head shake to reject a call3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Remappable controls

Yes1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026The shortcut on one or both earbuds can be customised in the Bose app5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 28: change or disable the shortcut, or assign a different shortcut to each earbud, in the Bose app

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026App reassigns left/right function groups, voice functions and Quick Access. No arbitrary individual-gesture remapping inferred.

Voice assistant

Not available

Amazon Alexa, Google app, Siri3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Separate Amazon Alexa, Android Google app and iPhone Siri chapters. Cloud/device/app/region restrictions apply. Some voice routes and Quick Access are unavailable under LE Audio. On-device playback Voice Control is represented in control_types, not invented as a cloud assistant.

Sensors and health

2 of 9 differ

In-ear detection

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 29: in-ear detection with auto play/pause, auto answer call and auto transparency

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Parts diagrams name built-in IR sensors. App enables automatic pause/resume and power-off when removed.

Sensors

IMU6Press releasebose.com/pressroom/bose-announces-new-quietcomfort-ultra-headphones-and-earbudsRead 6 October 2026Onboard IMU for Bose Immersive Audio

Infrared wear sensors3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

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

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 33: ActiveSense raises noise cancellation for sudden or loud noises in Aware mode, then returns

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.

S, M, L1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 20265Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 18: small, medium and large eartips are included. Medium comes attached.

SS, S, M, L3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Original manual page 9 exact standard box includes SS/S/M/L tips, two of each. M tips are fitted at purchase.

Ear tip materials

Silicone1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Soft silicone umbrella-shaped eartips

Silicone11Reviewsoundguys.com/sony-linkbuds-fit-review-127506Read 8 October 2026Exact review use section explicitly says the tips are made from a single piece of silicone.

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

Stability bands1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Bose Fit Kit stability bands in sizes 1, 2, 3

Fins3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Ear tip fit test

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 16: Earbud Seal Test in the Bose app

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Manual page 10 explicitly measures ear-tip air-tightness to find optimal tips, distinct from general wearing-condition check.

Dust and water rating, buds

IPX41Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026FAQ: passed IPX4 testing. The outside of the case should not be exposed to water, so no case rating is stored.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 14: the earbuds are rated IPX4

IPX44Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Exact Fit manual publishes IPX4 splash resistance for earbuds only. Sound conduit, air holes and microphone holes excluded. Charging case explicitly not water resistant.

Dust and water rating, case

Not available

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Water resistance depth

Not available

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Software

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Companion app

Bose app1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 20265Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 13: Bose app. Launch coverage names the earlier Bose Music app.

Sony | Sound Connect3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

App platforms

Android, iOS1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026

Android, iOS3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

User firmware updates

Yes5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 52: the earbuds update through the Bose app. The case updates through btu.Bose.com.

Yes3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Finding network

Not available

Not available

Precision findingiUWB in the case

Not available

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Live translation

Not available

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Dimensions and weight

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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

4.9g(0.2 oz)1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 2026Approximate one-earbud mass, including M ear tip and attached fitting supporter.3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Manual explicitly approximate one-earbud weight with M tip and fitting supporter.

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

Width20.1Height31.2Depth24.4mm(0.8 × 1.2 × 1 in)2Maker product pagebose.de/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 6 October 2026Einzelner Earbud 3.12 cm H x 2.01 cm W x 2.44 cm D. The US and UK pages give 1.23 in H x 0.79 in W x 0.96 in D, which agrees.

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

Not available

41g(1.4 oz)1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 2026Exact charging-case mass, separate from earbuds.3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Manual separately publishes charging-case weight, excluding earbud mass.

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

Width59.4Height66.3Depth26.7mm(2.3 × 2.6 × 1.1 in)2Maker product pagebose.de/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 6 October 2026Etui 6.63 cm H x 5.94 cm W x 2.67 cm D. The US and UK pages give 2.61 in H x 2.34 in W x 1.05 in D, which agrees.

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Certifications

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

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Hi-Res Audio Wireless8Maker product pagesony.jp/headphone/products/LinkBuds_Fit/feature_2.htmlRead 8 October 2026Exact model describes wireless high-resolution playback through LDAC and names its Hi-Res Audio Wireless certification. 990 kbps LDAC high-res content condition, not a lossless claim.

Communication certifications

Not available

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FCC IDs

A94408L, A94408R5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026FCC ID: A94408L / A94408R, IC: 3232A-408L / 3232A-408R

AK8YY297514Owner's manualbhphotovideo.com/lit_files/1165249.pdfRead 8 October 2026Original Sony Reference Guide 5-058-500-11(1), ©2024 Sony, exact LinkBuds Fit/YY2975. Page 1 headset regulatory block explicitly FCC ID AK8YY2975. Public B&H mirror of original two-page maker PDF.

Other certifications

Snapdragon Sound1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Wireless Connectivity lists Snapdragon Sound. The FAQ names Snapdragon Sound certification.5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Page 47: the earbuds feature Snapdragon Sound technology

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In the box

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In the box

2 Bose QuietComfort Ultra Earbuds, 3 pairs of eartips (S, M, L), 3 pairs of stability bands (1, 2, 3), Charging case, 30 cm USB-C® (A to C) cable, Safety sheet1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026What's in the box on the UK page. The US refurbished page lists the same cable as 12 inch.

Sony LinkBuds Fit earbuds with Air Fitting Supporters, Charging case, USB-A to USB-C cable, Documents, Soft fitting earbud tips (SS, S, M, L)3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Complete standard box list. Factory Air Fitting Supporters are attached. Separately sold covers/supporter colours and Olivia edition promotions excluded.

Cables included

ABose QuietComfort Ultra Earbuds

Type	Length (m)	Count
USB-C (A to C)	0.3	1

Source1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 202630 cm USB-C (A to C) cable

BSony LinkBuds Fit

Type	Count
USB-A to USB-C charging cable	1

Source3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026

Links

Not compared

Product page

www.bose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.html1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026The US product URL now returns a 404. The UK page is the live maker page for the new product.

www.sony.co.uk/headphones/products/linkbuds-fit2Maker product pagesony.co.uk/headphones/products/linkbuds-fitRead 5 October 2026Exact model maker product page. Fit is sealed-tip design.

Spec sheet

support.bose.com/article/quietcomfort-ultra-earbuds-specifications15Maker product pagesupport.bose.com/article/quietcomfort-ultra-earbuds-specificationsRead 7 October 2026Official Product Specifications support article identifies QuietComfort Ultra Earbuds, Sold from 2023. Public indexed specification body read. Direct page currently renders an empty support shell. This is an HTML specification sheet, not a claimed PDF download or second-generation page.

www.sony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specifications1Maker product pagesony.co.uk/electronics/support/wireless-headphones-bluetooth-headphones/wf-ls910n/specificationsRead 5 October 2026Full exact maker support technical table. Bluetooth transmission bandwidth is not acoustic frequency response. Unlabelled case dimensions are not assigned to width/height/depth. Published driver diameter is 8.4 mm, with dynamic technology separately documented. Physical quantity per earbud remains unproved. The driver row preserves the proved size/type without asserting a quantity, so total driver count remains unknown.

Manual

assets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdf5Owner's manualassets.bosecreative.com/m/157ea573fd945c2e/original/885502_OG_QCUE-HEADPHONEIN_en.pdfRead 6 October 2026Owner's guide 885502 for QUIETCOMFORT ULTRA EARBUDS, support.Bose.com/QCUE. PDF revision dated January 2026.

helpguide.sony.net/mdr/2975/v1/en/print.pdf3Owner's manualhelpguide.sony.net/mdr/2975/v1/en/print.pdfRead 5 October 2026Original exact English guide 154 pages. Box page 9, runtime page 28, specifications pages 153-154, app pages 124-125 inspected.

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

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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.

2years1Maker product pagebose.co.uk/p/earbuds/bose-quietcomfort-ultra-earbuds/QCUE-HEADPHONEIN.htmlRead 7 October 2026Exact current original-earbud UK maker page Why buy direct from Bose explicitly promises 2-year warranty. Applies to new product purchased directly from Bose UK. Does not generalize to US refurbished units, statutory rights or separately sold BoseCare extension.

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