Earbuds / Compare

Ozlo Sleepbuds 2 vs Samsung Galaxy Buds4 Pro

A

Product A: Ozlo

Sleepbuds 2

52 of 166 known

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B

Product B: Samsung

Galaxy Buds4 Pro

85 of 166 known

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All 166 fields

Every value links to where we found it.

Only differences

AOzlo Sleepbuds 2

BSamsung Galaxy Buds4 Pro

General

7 of 8 differ

Series

Sleepbuds1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026The product page and its user guide pages call the line Sleepbuds. The first generation is the Ozlo Sleepbuds.

Galaxy Buds3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Maker model heading names the Galaxy Buds4 series. Pro is the product level. The Galaxy Buds line is stored as the series, as for the other Galaxy Buds.

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

010021C01WW012Maker product pageozlosleep.com/products/sleepbuds.jsRead 15 October 2026US store product data: SKU 010021C01WW01, a single variant.

SM-R640, SM-R640NZKAXAR, SM-R640NZWAXAR, SM-R640NZDAXAR, SM-R640NZKADBT, SM-R640NZWADBT, SM-R640NZDADBT4Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026Exact product purchase configuration lists US XAR and German DBT SKU model codes.5Maker product pagesamsung.com/de/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026Germany black variant model code, parent model SM-R640.

GTIN / EAN

8500709611652Maker product pageozlosleep.com/products/sleepbuds.jsRead 15 October 2026US store barcode field: 850070961165. The Europe and UK store feeds list the same SKU and barcode.

Not available

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

28 July 20263Press articlesoundguys.com/ozlo-sleepbuds-2-launch-160755Read 15 October 2026The Tom's Guide launch review is dated 28 July 2026 and says the Sleepbuds 2 launch today.4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Published 28 July 2026: the Sleepbuds 2 launch today.7Press articletechcrunch.com/2026/07/28/ozlos-sleepbuds-2-build-on-boses-sleep-earbud-legacyRead 15 October 2026Unveiled on Tuesday 28 July 2026.

25 February 20267Press articlegsmarena.com/samsung_galaxy_buds4_and_buds4_pro_unveiled_with_new_blades_better_audio-news-71709.phpRead 30 September 2026Unveiled 25 February 2026 alongside the Galaxy S 26

Status

Available2Maker product pageozlosleep.com/products/sleepbuds.jsRead 15 October 2026US store lists the product as available on 2026-10-15.

Available4Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026On sale on samsung.com/us on 2026-09-30

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

Not available

Samsung Galaxy Buds3 Pro14Measurementrtings.com/headphones/reviews/samsung/galaxy-buds3-pro-truly-wirelessRead 23 October 2026A notice on the RTINGS Galaxy Buds3 Pro review says these headphones were replaced by the Samsung Galaxy Buds4 Pro.15Reviewtomsguide.com/audio/earbuds/embargo-25th-feb-6pm-gmt-samsung-announces-galaxy-buds-4-and-galaxy-buds-4-pro-5-key-features-you-can-expectRead 23 October 2026Tom's Guide names the Galaxy Buds 3 and Galaxy Buds 3 Pro as the predecessors of the Galaxy Buds 4 and Buds 4 Pro.

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.

$2791Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026The US store lists 279 USD with a free sleep mask for a limited time. SoundGuys news and the Tom's Guide launch review give the 279 USD launch price.3Press articlesoundguys.com/ozlo-sleepbuds-2-launch-160755Read 15 October 2026SoundGuys news, 29 Jul 2026: Ozlo Sleepbuds 2, a 279 USD pair.4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Review: launching with a sale price of 279 USD.7Press articletechcrunch.com/2026/07/28/ozlos-sleepbuds-2-build-on-boses-sleep-earbud-legacyRead 15 October 2026TechCrunch, 28 Jul 2026: priced at 279 USD, 30 USD above the original Sleepbuds. A sleep mask and travel case come with a purchase for a limited time.

$249.9910Press releasenews.samsung.com/us/samsung-galaxy-s26-series-galaxy-buds4-series-now-available-worldwideRead 30 September 2026Launch availability release March 2026: Galaxy Buds 4 Pro $249.99, standard Buds 4 $179.99.

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

€24911Press releasenews.samsung.com/de/top-klang-trifft-auf-tragekomfort-samsung-prasentiert-galaxy-buds4-serieRead 30 September 2026Launch Pricing and Availability: Buds 4 Pro UVP €249. Standard Buds 4 €179.

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

US, EU, GB1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026US store plus Europe (ozlosleep.eu) and UK (ozlosleep.co.uk) stores. Documented subset. The warranty is 1 year in the US and 2 years in the EU and UK. No euro or pound launch price is stored, since only current store prices were found.

US, DE4Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026Exact product purchase configurations in US and German maker stores.5Maker product pagesamsung.com/de/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026The German maker store lists the black variant as in stock.

ColoursiThe maker's own colour names

Not available

Black, White, Pink Gold1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 20263Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Pink Gold is an online exclusive4Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-pro/buyRead 30 September 2026

Segment

Sleep1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Maker: sleep earbuds, designed for sleep only.

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.

In-ear1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Passive noise cancellation via silicone tips (not ANC). The silicone tips seal the ear.5Reviewsoundguys.com/ozlo-sleepbuds-2-review-161143Read 15 October 2026Review: passive isolation depends on how well the silicone tips seal in your ears.

In-ear1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026"canal-fit design"

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

Stemless1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026The earbuds are a small low-profile body with no stalk, as shown on the product page. A silicone tip with a wing carries each body.

Stem1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Blade (stem)

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

Not available

Either bud8Reviewsoundguys.com/samsung-galaxy-buds-4-pro-review-153435Read 30 September 2026Review FAQ confirms either earbud can be used individually.

RGB lighting

Not available

Not available

Drivers and sound

10 of 17 differ

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

AOzlo Sleepbuds 2

Type
Balanced armature

Source16Press articleaudioxpress.com/news/ozlo-launches-sleepbuds-2-expanding-sleep-earbuds-as-a-specialized-audio-categoryRead 21 October 2026Same sentence names one new balanced armature driver. No count, role or size is stated, so only the type is stored.

BSamsung Galaxy Buds4 Pro

Type	Role	Diameter (mm)	Count per earbud
Dynamic	Woofer	11	1
Not available	Tweeter	Not available	1

Source1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Speaker: Φ11 3.5 t (WF) / 5.5 x 3.5 x 0.9 T (TW). The tweeter is 5.5 x 3.5 mm, not round, so no single size. Driver type not stated13Maker product pagesamsung.com/us/audio-sound/galaxy-buds4Read 8 October 2026Find the best Galaxy Buds comparison, exact Pro column: Enhanced Dynamic Driver (Woofer) plus Tweeter. This establishes dynamic woofer technology only. Tweeter diameter remains unknown.

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

Balanced armature16Press articleaudioxpress.com/news/ozlo-launches-sleepbuds-2-expanding-sleep-earbuds-as-a-specialized-audio-categoryRead 21 October 2026audioXpress, launch news: Ozlo says Sleepbuds 2 use a super-efficient custom audio amplifier paired with a new balanced armature driver. The maker product page, help center and press release name an amplifier but no driver type.

Not available

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

Not available

11mm=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

2=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.

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

96kHz1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Pro Sound Quality column: 96 kHz UHQ requires listed Samsung Galaxy devices with One UI 6.1.1+.

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

24bits1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Pro Sound Quality column: 24-bit Hi-Fi requires compatible Samsung Galaxy devices/One UI 4.0+, 96 kHz UHQ requires 6.1.1+.

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

Not available

Yes1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 20266Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Adjust sound to fit

Personalised soundiA profile from a hearing test or ear scan

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Adapt sound (Galaxy Buds 4 Pro only)

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.

Not available

93Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026"9-Band Equalizer"

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

Balance, Focus, Spoken Word, Airplane Mode4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Audio Tuning profiles in the app: Balance, Focus, Spoken Word and Airplane Mode. Ozlo calls this tuning. It changes the audio for the content or the setting.

Not available

Volume limit

Not available

Not available

Spatial audio

2 of 2 differ

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

Not available

360 Audio3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026360 Audio paragraph expressly mentions head tracking.

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

Not available

Yes3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026360 Audio paragraph expressly mentions head tracking.

Noise cancelling

6 of 11 differ

Active noise cancelling

No1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Tech specs, Noise Masking: passive noise cancellation via silicone tips (not ANC). FAQ: block and replace noise masking is different from active noise cancellation.

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: ANC yes.

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

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Adaptive ANC yes.

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

No8Press articlethe-gadgeteer.com/2026/07/29/ozlo-sleepbuds-2-sleep-earbudsRead 15 October 2026Article of 29 Jul 2026: no microphone array, no transparency mode and no calls. The earbuds have no microphones, so a transparency mode cannot exist.

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Ambient Sound yes.

Adjustable transparency

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Ambient sound volume slider (Galaxy Buds 4 Pro only)

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

Not available

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Adaptive Noise Control yes.

Conversation detection

Not available

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Voice Detection yes.

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

5 of 23 differ

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

Not available

Warm sound signature. Bass emphasized, treble slightly underemphasized.9Measurementrtings.com/headphones/reviews/samsung/galaxy-buds4-proRead 30 September 2026Sound signature: Warm. Detailed results are members only and were not read

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

3dB9Measurementrtings.com/headphones/reviews/samsung/galaxy-buds4-proRead 30 September 2026Public summary on test bench 2.3: Emphasized (3 dB)

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

-2dB9Measurementrtings.com/headphones/reviews/samsung/galaxy-buds4-proRead 30 September 2026Slightly Underemphasized (-2 dB)

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

Not available

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.

AOzlo Sleepbuds 2

Not available

BSamsung Galaxy Buds4 Pro

Hours (h)
6.02

Source8Reviewsoundguys.com/samsung-galaxy-buds-4-pro-review-153435Read 30 September 20266 h 1 min in the SoundGuys standardized battery test. ANC setting and codec not stated

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

Not available

6.02h=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

5 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.

01Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Tech specs: No microphone, designed for sleep only. FAQ: there is no microphone in the Sleepbuds to support phone calls.

63Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026HD Voice feature: six microphones isolate the voice for calls. The companion video text explicitly gives three per earbud, six across pair.

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.

01Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026No microphone in the earbuds. The Smart Case has a microphone that only measures room noise. The case is excluded from this count.

61Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Pro microphone column: two HSNR digital plus one digital microphone per earbud, six across the pair. VPU is not a microphone.2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 20263Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026

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

Yes8Reviewsoundguys.com/samsung-galaxy-buds-4-pro-review-153435Read 30 September 2026Exact model mic review calls voice pickups bone conduction.

Mic noise reduction

Not available

AI1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Machine learning models for noise reduction (DNN)

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

Not available

Super wideband6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Advanced quality: Super wideband speech 16 kHz. The source must be a qualified compatible Galaxy phone. (PDF page 28)

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

Bluetooth1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Bluetooth only. The Smart Case connects to the phone over Bluetooth Classic.

Bluetooth2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Bluetooth 6.1.

Bluetooth

5.31Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Connection section: Bluetooth 5.3 radios.

6.12Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: Bluetooth 6.1.

Bluetooth codecs

Not available

SBC, AAC, Samsung Seamless, SSC UHQ, LC32Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: AAC, SBC, SSC, SSC-UHQ and LC3.

Bluetooth profiles

A2DP1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Connectivity: Bluetooth 5.3 (A2DP + Low Energy Audio). Only A2DP is named as an audio profile.

A2DP, AVRCP, HFP, PBP, TMAP2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Technical specifications: A2DP, AVRCP, HFP, PBP, TMAP.

LE Audio

Yes1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Connectivity: Bluetooth 5.3 radios supporting A2DP and Low Energy Audio (LEA) enabled streaming. No independent test of LE Audio was found.

Yes2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Exact R640 German specs row: LE Audio yes.

Auracast

Not available

Yes1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 20266Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Listen to audio broadcast

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

No5Reviewsoundguys.com/ozlo-sleepbuds-2-review-161143Read 15 October 2026Review cons: no Bluetooth multipoint. The buds can only connect to one device at a time. Firmware 02.11.2606011.

No8Reviewsoundguys.com/samsung-galaxy-buds-4-pro-review-153435Read 30 September 2026"The earbuds don't support true Multipoint"

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

Not available

Not available

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.

Not available

Not available

Automatic switching between own devicesiThrough the maker's account

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Auto Switch Buds automatically switches between own Galaxy devices for call and media. (PDF page 30)

Fast pairing

Not available

Not available

Audio sharingiShare one stream with a second pair

Not available

Not available

Wireless range (claimed)

Not available

Not available

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

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Gaming mode under Labs, Samsung mobile devices only

Claimed latency

Not available

Not available

Lowest claimed latency

Not available

Not available

Compatibility

2 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 pageozlosleep.com/products/sleepbudsRead 15 October 2026The page lists streaming from any Bluetooth source and the Ozlo Sleep app for iOS and Android.

Android, iOS2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Compatibility: Bluetooth audio works with iOS as well as Android. Advanced earbud settings require compatible Android/Galaxy device.

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.

AOzlo Sleepbuds 2

Not available

BSamsung Galaxy Buds4 Pro

Platform	Connection	Microphone works
Android	Bluetooth	Yes
iOS	Bluetooth	Yes

Source12Maker spec sheet (PDF)image-us.samsung.com/SamsungUS/home/mobile/audio-sound/galaxy-buds4/Buds4F-Available-Features-by-Device-As-of-2026-03-03.pdfRead 8 October 2026Page 1 exact Pro column: standard audio/call streaming on Galaxy, other Android, and other Bluetooth devices including iOS/PC. Stored phone routes require a compatible Bluetooth host. No direct Xbox/PlayStation support is inferred from the generic console category.

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

AOzlo Sleepbuds 2

Feature	Needs
Setup and audio streaming	A phone and an active Bluetooth connection are needed to set up the earbuds and to stream audio. The earbuds connect to the Smart Case and the Smart Case connects to the phone.
Ozlo Sleep app	Android 12 or later. The product page says iOS 17 or later on iPhone and iPad. The help center says iOS 18 or later on iPhone and iPad.
Phone-free Sleep Sound	The earbuds can start the built-in Sleep Sound when taken out of the case, with no phone or Bluetooth connection. This is set up in the app.
In-ear alarm	Set in the Ozlo app. It works without a phone connection and in Bluetooth Disabled mode.
Battery test	Ozlo test with streaming audio and Sleep Sounds at 50 percent volume.

Source1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026FAQ and System Requirements sections.10Maker product pageozlo-sleepbuds-2.gorgias.help/en-US/what-are-the-app-requirements-7597631Read 21 October 2026Help center, What are the app requirements: iOS 18 or later on iPhone and iPad, Android 12 or later on phones. The product page FAQ says iOS 17 or later. Both are kept in the requirement text, since the maker documents disagree. The App Content and Sound Library Specs article says iOS 18 or later and Android 12 or later.

BSamsung Galaxy Buds4 Pro

Feature	Needs
Ultra High Quality audio up to 24-bit / 96 kHz	Galaxy S26, S25, S24 and S23 Series, Z Fold7, Z Flip7, Z Fold6, Z Flip6, Z Fold5, Z Flip5, Tab S11, Tab S10 and Tab S9 Series with One UI 6.1.1+. UHQ is off by default. Use phone settings on One UI 8.0+ or Galaxy Wearable on earlier versions.
Super wideband calls	Samsung March 3, 2026 chart lists S26 / S25 Series, Z Fold7 / Fold6 / Flip7 / Flip6, Tab S11 / S10 Series, S25 FE / S24 FE, A57, A56, A37, A36, A17 and A16. Maker product FAQ requires One UI 6.1.1+ and warns that support also depends on the mobile network.
360 Audio	Samsung Galaxy smartphones and Galaxy Tab devices with One UI 3.1 or later, and selected Samsung TV models
Head gestures	Compatible Galaxy device with One UI 8.5 or later. Feature is off by default and requires setup. Samsung account required for Galaxy Wearable settings.
Advanced settings	One UI 8.0 or later, or the Galaxy Wearable app on Android 12.0 or above with at least 1.5 GB of memory. Not supported on iOS
Gaming mode	Samsung mobile device
Interpreter	Galaxy smartphone with Galaxy AI on One UI 6.1.1 or later
24-bit / 48 kHz audio	Samsung March 3, 2026 compatibility chart lists Galaxy S25 FE, S24 FE, A57, A56, A37, A36, A17 and A16 as 24-bit / 48 kHz hosts, not 96 kHz hosts.
Saved settings on iOS or other Bluetooth devices	First enable Adaptive Noise Control, Adaptive ANC/EQ, Equalizer, Voice/Siren Detect or Voice Command through Galaxy Wearable on Android. These enabled features persist on other Bluetooth devices until disabled through the same Android process.
Auracast	Galaxy or other Android source device with Auracast capability. Samsung March 3, 2026 compatibility chart does not support Auracast on iOS or other Bluetooth devices.
Auto Switch	Samsung account registered through Galaxy Wearable. Samsung chart supports Galaxy and other Android devices, not iOS or other Bluetooth devices.

Source3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Current FAQ retains S23/S24, Fold5 / Flip5 and Tab S9 among 96 kHz hosts absent from the shorter March chart. UHQ is off by default. One UI 8.0 refers to settings location, not eligibility. SWB also depends on network support.6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 202612Maker spec sheet (PDF)image-us.samsung.com/SamsungUS/home/mobile/audio-sound/galaxy-buds4/Buds4F-Available-Features-by-Device-As-of-2026-03-03.pdfRead 8 October 2026As of 3 March 2026. Page 2 distinguishes 96 kHz hosts from S25 FE / S24 FE and listed A-series 48 kHz hosts, which also support SWB. Page 1 footnote **: listed Android-enabled settings persist on other Bluetooth hosts until disabled in Wear. Product FAQ separately lists older 96 kHz hosts absent from the shorter chart. No custom-profile capacity or firmware-independent storage claim is inferred.

Official licence

Not available

Not available

Battery and charging

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

Not available

61mAh1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Typical. Rated 57 mAh2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Technical specifications: 61 mAh typical, not 57 mAh rated.

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.

AOzlo Sleepbuds 2

Mode	Includes case recharges	Hours (h)
ANC off	No	14

Source1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Up to 14 hours on a single charge. Footnote: Ozlo testing with Sleepbuds 2 playing streaming audio and Sleep Sounds at 50 percent volume. Results with other audio, volume, Bluetooth use and features vary. No codec is named. The case claim is stored as charging guidance because the maker gives only a number of recharges.

BSamsung Galaxy Buds4 Pro

Mode	Includes case recharges	Hours (h)
ANC on	No	6
ANC off	No	7
ANC on	Yes	26
ANC off	Yes	30
Call	No	5
Call	Yes	22

Source1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Pro column: 6 h ANC on/7 h off earbuds-only. 26 h on/30 h off case-inclusive. Call 5 h/22 h totals with ANC off, versus 4.5 h/20 h ANC on. The stored call claim uses ANC off.2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026

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.

14h=CalculatedFrom Claimed battery life

7h=CalculatedFrom Claimed battery life

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

Not available

6h=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.

14h=CalculatedFrom Claimed battery life

7h=CalculatedFrom Claimed battery life

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

Not available

30h=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

26h=CalculatedFrom Claimed battery life

Talk time (claimed)

Not available

5h=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.

180min9Maker product pageozlo-sleepbuds-2.gorgias.help/en-US/battery-and-charging-specs-7597612Read 21 October 2026Ozlo Sleepbuds 2 help center, Battery & Charging Specs: Sleepbuds full charge approximately 3 hours. The article How long do Sleepbuds 2 take to charge gives the same figure. The Sleepbuds charge only in the Smart Case. Maker estimate, not a measurement.

Not available

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.

The Smart Case holds an additional 2 to 3 charges for the earbuds. The maker gives no total runtime with the case.1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Battery section: the Smart Case holds an additional 2-3 charges. SoundGuys measured roughly three to four recharges.5Reviewsoundguys.com/ozlo-sleepbuds-2-review-161143Read 15 October 2026Review: after streaming for eight hours about 30 percent was left, and the case adds roughly three to four full recharges.

Not available

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

Not available

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.

Not available

Not available

Charging case

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

Not available

530mAh1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Typical. Rated 515 mAh2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Technical specifications: 530 mAh typical, not 515 mAh rated.

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 pageozlosleep.com/products/sleepbudsRead 15 October 2026Charges via USB-C. The charging cable is in the box.

USB-C6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 20268Reviewsoundguys.com/samsung-galaxy-buds-4-pro-review-153435Read 30 September 2026USB-C port on the back of the case

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

150min9Maker product pageozlo-sleepbuds-2.gorgias.help/en-US/battery-and-charging-specs-7597612Read 21 October 2026Same article: Smart Case full charge about 2.5 hours under normal conditions, by USB-C. The user guide pages written for the original Sleepbuds say up to 8 hours with the Sleepbuds outside the case, so the Sleepbuds 2 help center figure is used.

Not available

Wireless charging

No1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026FAQ: Does the Smart Case support wireless charging? No.5Reviewsoundguys.com/ozlo-sleepbuds-2-review-161143Read 15 October 2026Review cons: the case charges over USB-C only and has no wireless charging.

Yes3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Exact-model FAQ: Galaxy Buds4 Pro charging case supports wireless charging.

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

Not available

Controls

5 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.

Not available

Pressure, Swipe, Head gestures, Voice commands3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Pinch on a force sensor, swipe for volume, head gestures, voice commands (Buds 4 Pro only)

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

None4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Review, App and controls: in the app you can select the soundscape, set the in-ear alarm, adjust the volume or change the Sleep Mode. No earbud controls are described.11Maker product pageozlo-sleepbuds-2.gorgias.help/en-US/what-are-the-specific-differences-between-the-original-sleepbuds-and-sleepbuds-2-7597351Read 21 October 2026Help center comparison table, Phone-Free Controls: the original Sleepbuds need the Ozlo app. Sleepbuds 2 add a multifunction button on the Smart Case for pairing and playback control. No control on the earbuds is documented, and the maker hardware overview lists none. Volume is set in the Ozlo app. The Smart Case button has no volume function.

Swipe6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Earbud controls table: pinch, double, triple, hold and swipe volume. (PDF page 17)

Gestures

Not available

Pinch, Double pinch, Triple pinch, Pinch and hold, Swipe up or down, Nod or shake head6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Earbud controls table: pinch, double, triple, hold and swipe volume. (PDF page 17)

Remappable controls

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Manual page 24: left and right pinch-and-hold shortcuts can be assigned independently.

Voice assistant

Not available

Bixby, Gemini, Perplexity1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026AI agents Bixby, Google Gemini and Perplexity started hands-free

Sensors and health

3 of 9 differ

In-ear detection

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026In-ear detection routing. (PDF page 31)

Sensors

Sleep-detecting accelerometer in the earbuds, Ambient noise detection in the Smart Case, Ambient temperature sensor in the Smart Case, Ambient light sensor in the Smart Case1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Sensors section: Smart Case button, ambient noise detection, ambient temperature sensor and ambient light sensor. Sleepbuds: sleep-detecting accelerometer.

Voice Pickup Unit (VPU), Force & Touch (Swipe), SWIR, Accelerometer, Gyro, Hall sensor1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Verbatim from the Buds 4 Pro spec column

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

Sleep tracking with Sleep Patterns, Room noise, light and temperature tracking in the Smart Case1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Sleep Patterns tracking in the Ozlo Sleep app, with environment insights from the Smart Case sensors.

Neck stretch reminders6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Neck stretch reminders for a head position held ten minutes. (PDF page 31)

Fit and durability

4 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.

0 (extra small), 1 (small), 2 (medium), 3 (large)1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026In the box: 4 sizes of soft silicone tips. Size names are in the hardware overview guide and the Tom's Guide review.4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Review: wing tip sizes range from 0 (smallest) to 3 (biggest), size 2 pre-loaded.6Owner's manualozlosleep.com/blogs/user-guide/hardware-overviewRead 15 October 2026Sleepbuds hardware overview guide (dated 4 August 2026): 4 different size silicone tips numbered 0 extra small, 1 small, 2 medium and 3 large. The guide is written for the Ozlo Sleepbuds family and Tom's Guide confirms sizes 0 to 3 for the Sleepbuds 2.

S, M, L3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Exact model FAQ: 3 sets, small, medium and large. Medium is installed.

Ear tip materials

Silicone1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Soft silicone tips.

Silicone3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026FAQ: "3 sets of silicone ear tips"

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

Wing tips4Reviewtomsguide.com/wellness/sleep-tech/ozlo-sleepbuds-2Read 15 October 2026Review: custom-fit soft silicone wingtips act as an anchor. Sizes run from 0 to 3, with size 2 fitted.

Not available

Ear tip fit test

Not available

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Manual page 28: Earbud fit test applies to Galaxy Buds4 Pro.

Dust and water rating, buds

IPX41Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Sleepbuds offer protection against dust, sweat and light rain (IPX4). No dust rating is given, so the rating is IPX4.

IP571Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026IP57, earbuds only2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 20266Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026

Dust and water rating, case

Not available

Not available

Water resistance depth

Not available

Not available

Software

4 of 6 differ

Companion app

Ozlo Sleep app1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Ozlo Sleep App, iOS and Android.

Galaxy Wearable3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Exact model linked app compatibility: Android 12+, minimum 1.5 GB memory.6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Access features via device Settings One UI 8+ or Galaxy Wearable. (PDF page 21)

App platforms

Android, iOS1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Ozlo Sleep App for iOS and Android. Android 12 or later, iOS 17 or later.

Android3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Exact model linked app compatibility: Android 12+, minimum 1.5 GB memory.6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Access features via device Settings One UI 8+ or Galaxy Wearable. (PDF page 21)

User firmware updates

Yes13Maker product pageozlosleep.com/blogs/release-notes/tagged/sleepbudsRead 21 October 2026Release notes list Sleepbuds 2 firmware 02.11.2606025 for the Smart Case, both earbuds and the Bluetooth module, with an Update with Web App button. The iOS app note mentions faster firmware update downloads. The Ozlo site also links a Sleepbuds Updater.

Yes6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Earbuds software update user instructions. (PDF page 34)

Finding network

Not available

Samsung Find2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Services and Apps: Samsung Find Yes.

Precision findingiUWB in the case

Not available

Not available

Live translation

Not available

Yes3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Interpreter section: paired Galaxy S26, Samsung Phone app, live call translation and face-to-face phone-screen interpretation.

Dimensions and weight

4 of 4 differ

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

1.6g(0.1 oz)1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Tech specifications: 0.06 oz (1.6 g each), without the silicone tip.

5.1g(0.2 oz)1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026With M size ear tip2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026

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

Width17Height11Depth12mm(0.7 × 0.4 × 0.5 in)1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Tech specifications, earbuds without silicone tip: height 11 mm, width 17 mm, depth 12 mm. Axes are labelled by the maker.

Width18.1Height30.9Depth19.6mm(0.7 × 1.2 × 0.8 in)1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026Earbud 18.1 x 19.6 x 30.9 mm, axes from the Samsung EU spec table (H 30.9, W 18.1, D 19.6)2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026Technical specifications explicitly H 30.9 x W 18.1 x D 19.6 mm.

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

96g(3.4 oz)1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Smart Case without Sleepbuds inside: 3.5 oz (96 g).

44.3g(1.6 oz)1Press releasenews.samsung.com/global/samsung-unveils-all-new-galaxy-buds4-series-with-ultimate-soundRead 30 September 2026With M size ear tip, as listed2Maker product pagesamsung.com/de/audio-sound/galaxy-buds/galaxy-buds4-pro-black-sm-r640nzkadbtRead 30 September 2026

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

Width78Height78Depth27mm(3.1 × 3.1 × 1.1 in)1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Smart Case: height 78 mm, width 78 mm, depth 27 mm. Axes are labelled by the maker.

Not available

Certifications

0 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

Not available

FCC IDs

2BAGA010021L, 2BAGA01002114Regulatory filingfccid.io/2BAGA010021LRead 21 October 2026FCC grant 2BAGA010021L for the Sleepbuds earbuds, model 010021L, applicant Drowsy Digital Inc (the company named in the Ozlo site copyright), granted 2026-05-22. Product code 010021 matches the Sleepbuds 2 SKU 010021C01WW01. The first generation grant is 2BAGA010011L. The case grant 2BAGA010021 is the second entry.15Regulatory filingfccid.io/2BAGA010021Read 21 October 2026FCC grant 2BAGA010021 for the Charging Case, model 010021, applicant Drowsy Digital Inc, granted 2026-05-22. The SAR report lists a 75 x 75 x 25 mm case body. The maker states 78 x 78 x 27 mm.

Not available

Other certifications

Not available

Not available

In the box

2 of 2 differ

In the box

Sleepbuds 2 earbuds, Smart Case (charging and storage case), 4 sizes of soft silicone tips, Charging cable, Quick Start Guide1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026Included in the box: Ozlo Sleepbuds, charging and storage case, 4 sizes of soft silicone tips, charging cable.12Owner's manualozlosleep.com/blogs/blogs/sleepbuds-2-guideRead 21 October 2026Section 1 Unboxing: Sleepbuds 2, Smart Charging Case, USB-C charging cable, four sizes of silicone ear tips and Quick Start Guide.

Earbuds, 3 sets of ear tips (S/M/L), Charging Case, Quick Start Guide3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026FAQ. Charger and USB Type-C cable not included

Cables included

AOzlo Sleepbuds 2

Type	Count
USB-C	1

Source12Owner's manualozlosleep.com/blogs/blogs/sleepbuds-2-guideRead 21 October 2026Section 1 Unboxing: one USB-C charging cable. No length or other connector is stated.

BSamsung Galaxy Buds4 Pro

Not available

Links

Not compared

Product page

ozlosleep.com/products/sleepbuds1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026

www.samsung.com/us/audio-sound/galaxy-buds4-pro3Maker product pagesamsung.com/us/audio-sound/galaxy-buds4-proRead 8 October 2026Opened exact maker product page heading.

Spec sheet

Not available

Not available

Manual

ozlosleep.com/blogs/blogs/sleepbuds-2-guide12Owner's manualozlosleep.com/blogs/blogs/sleepbuds-2-guideRead 21 October 2026Ozlo Complete Guide for Sleepbuds 2: unboxing, setup, Smart Case button, sleep modes and care. No PDF manual was found.

downloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdf6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026Maker user guide cover. (PDF page 1)

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

0 of 1 differ

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

1year1Maker product pageozlosleep.com/products/sleepbudsRead 15 October 2026FAQ: Ozlo Sleepbuds come with a 1-year warranty. In the EU and UK, that is extended to two years. The US term is stored.

1year6Owner's manualdownloadcenter.samsung.com/content/UM/202603/20260311043809413/WEA_R540_R640_EN_UG_YLA_022626_FINAL.pdfRead 30 September 2026US: Standard One-year Limited Warranty

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