Headsets and headphones / Compare

CMF Headphone Pro vs Sennheiser HD 280 PRO

A

Product A: CMF

Headphone Pro

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B

Product B: Sennheiser

HD 280 PRO

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Only differences

ACMF Headphone Pro

BSennheiser HD 280 PRO

General

5 of 8 differ

Series

Not available

Not available

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

B175, 69744342267221Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026Original manufacturer FCC manual identifies B175. Current US maker variant payload labels Dark Grey SKU 6974434226722. The numeric SKU is not stored as a GTIN without a barcode label.26Maker spec sheet (PDF)s3.zoommer.ge/site/certificate/nothing-cmf-headphone-pro.pdfRead 8 October 2026The signed original maker EU Declaration of Conformity identifies physical model B175 and battery M653035. Regulatory model identity is independent of the US color SKU. The signature date is not a retail release date.

5068451Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Article no. 506845. Older retailer listings also show article 004974 for the pre-2016 version, which is not stored.

GTIN / EAN

Not available

615104271210, 40441552077748Retailer pagebhphotovideo.com/c/product/1320366-REG/sennheiser_hd_280_pro_closed.htmlRead 23 October 2026Kit page. The section for the HD 280 Pro headphones alone lists UPC 615104271210.9Retailer pagefleetnetwork.ca/products/506845Read 23 October 2026SKU and MPN 506845, UPC 615104271210.10Spec databasevideotesty.pl/produkt/215617Read 23 October 2026EAN 4044155207774, manufacturer code S506845. The eBay Germany listing for MPN 506845 gives the same number as its GTIN.

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

29 September 202518Reviewsoundguys.com/the-cmf-headphone-pro-packs-high-end-specs-for-a-low-price-tag-145307Read 8 October 2026The September 29, 2025 launch report documents the announcement and separates UK/EU same-day availability from October 7 US availability. The partner press release corroborates the regional sales dates.

September 20166Press articlemixonline.comRead 23 October 2026Trade report dated 09/30/2016 on the upgraded HD 280 PRO shown at the AES Convention in Los Angeles that week. audioXpress reported it on 2016-10-07.

Status

Available1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact Dark Grey US variant payload states availableForSale true.

Available1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Current US maker page with dealer links.

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

Not available

Not available

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

Not available

Not available

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

$9916Press releasestorage.mfn.se/194a0e7c-3d3b-4dc0-bde1-0e70c39715f9/audiodo-and-cmf-by-nothing-expand-partnership-with-new-headphone-pro.pdfRead 8 October 2026The September 30, 2025 Audiodo maker-partner release expressly lists USD 99 and US sales beginning October 7, 2025. Current retail prices and EU regional pricing are not substituted.

$99.956Press articlemixonline.comRead 23 October 2026Reports a price of $99.95 for the upgraded model. US dollars, tax treatment not stated. The current US maker page also lists $99.95.

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.

US1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The current US maker store offers the exact Dark Grey reference.

Not available

ColoursiThe maker's own colour names

Dark Grey1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The reference is the original Dark Grey headset with its fitted Dark Grey cushions. Other headset finishes and separately sold cushion colors are excluded.

Black7Retailer pagethomann.ie/sennheiser_hd_280_pro_new.htmRead 23 October 2026Colour: Black.12Reviewrtings.com/headphones/reviews/sennheiser/hd-280-pro-2016Read 23 October 2026Differences section: one colour variant, Black. A Silver variant was sold for a limited time and is discontinued.

Segment

Music1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker positions the product for music listening and audio playback.

Studio1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Page title: Closed-Back Professional Monitoring. Described as headphones for professional recording, mixing and monitoring.

Design

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Form factor

Over-ear1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly describes its first over-ear headphones.

Over-ear1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Features: Circumaural (over-ear) fit for full coverage. The page's Wearing style row says On-ear, which the maker's own spec sheet and feature text contradict. Stored as over-ear since the product specification states ear coupling circumaural.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Ear coupling circumaural.

Ear cup enclosureiClosed, open or semi-open acoustic enclosure. This does not describe how the headset folds.

Closed11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact Acoustic Design field states Closed-back. Tom's Guide specifications corroborate this.

Closed1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Page title and summary: closed-back headphones.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Acoustic principle dynamic, closed.

Wearing style

Headband1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker comfort section describes the adjustable headband. The original guide documents adjustment by sliding the arms.

Headband2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Wearing style headband.

FoldingiFlat means the ear cups rotate flat. Inward means the ear cups fold toward the headband.

Flat12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact review states that the headphones rotate flat for storage but do not fold inward.

Flat and inward1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Features: Collapsible, foldable design. Comfort text: Swiveling earcups and a folding headband make them easy to adjust and store. The spec sheet says folding and rotating earcups and the quick guide shows folded positions A, B and C with the cups turned and tucked toward the headband. Stored as flat and inward.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Features: Folding and rotating earcups for space-saving transport.

Swivelling ear cupsiEar cups can rotate relative to the headband. Tilting alone does not count.

Yes12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact design discussion explicitly describes flat rotation of the ear cups.

Yes1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Comfort text: Swiveling earcups.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Text: swiveling ear cups. Features: rotating earcups.

RGB lighting

Not available

Not available

Lighting zonesiNumber of independently controllable lighting areas across both ear cups.

Not available

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Drivers and sound

12 of 20 differ

Driver type

Dynamic11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications explicitly state Dynamic driver. Voice-coil material alone is not used as transducer-type proof.

Dynamic1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Transducer type Dynamic.

Driver sizeiDiameter of the largest sound driver. Do not use the microphone capsule diameter.

40mm1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Drivers table and Packed with Power section state 40 mm. The 16.5 mm copper voice coil is not a driver diameter.

Not available

Drivers per sideiNumber of sound-producing transducers in one side, excluding microphones.

Not available

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Diaphragm material

PEN+PU dome with nickel plating1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Diaphragm table states PEN+PU dome material and nickel plating. Magnet material is not stated.

Not available

Magnet

Not available

Neodymium8Retailer pagebhphotovideo.com/c/product/1320366-REG/sennheiser_hd_280_pro_closed.htmlRead 23 October 2026Features: Neodymium magnets for high maximum SPL.

Frequency response (wired or passive)iPublished acoustic range for wired listening, or the maker’s single range when no mode is distinguished. Power state and test standard belong in the source note.

Min20 HzMax20 kHz11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications state 20 to 20,000 Hz acoustic frequency response. Tom's Guide independently labels the same frequency response. No mode, tolerance, or test level is stated. The maker's ambiguous RF label is not used as transmission bandwidth proof.

Min8 HzMax25 kHz1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Audio frequency response 8 - 25,000 Hz. No tolerance is given.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Frequency response 8 Hz to 25 kHz.

Wireless audio transmission bandiFrequency range of audio transmitted over the wireless connection, not the acoustic response of the driver. Codec, sampling rate and bitrate conditions belong in the source note. When the maker gives a range per codec, the widest range is stored and its codec goes in the source note.

Not available

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Impedance (passive when specified)iUse the headset-off value for a passive analog connection when the maker publishes both powered and passive values. Note the power state and test frequency.

16Ω11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications state 16 ohms. The Tom's Guide specification table agrees. Frequency and powered/passive measurement state are unspecified. Unverified comparison sites give conflicting figures and are excluded.

64Ω1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Nominal impedance 64 ohm.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Nominal impedance 64 ohm.

Sensitivity (passive when specified)iUse the headset-off figure when both powered and passive values exist. The power or voltage reference, test distance and frequency belong in the source note.

Not available

113dB5Owner's manualla-bs.com/Objets/HD280PRO_me.pdfRead 23 October 2026Maker instructions dated 06.06.2002 for the HD 280 pro and HD 280 silver, hosted by a retailer, so this is the first generation and not the 2016 article. Specifications: Sound pressure level 113 dB / 1 Vrms, and 102 dB as per IEC 268-7. The 2016 spec sheet gives the same 113 dB without a reference. The maker said the audio properties were unchanged in the 2016 update.

Sensitivity referenceiPublished power or voltage reference for sensitivity. Do not assume 1 mW when the source gives only a dB value.

Not available

Per 1 V5Owner's manualla-bs.com/Objets/HD280PRO_me.pdfRead 23 October 2026113 dB / 1 Vrms in the first-generation manual. The current sheets do not state the reference.

THD (claimed)iPublished distortion figure or numerical upper bound. The source note states any less-than sign and test level.

Not available

0.1%1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Total harmonic distortion 0.1 %. The quick guide gives the test condition as less than 0.1 % at 1 kHz and 100 dB SPL. Stored as the upper bound.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: THD 0.1 %. No test level is given on this sheet.3Owner's manualassets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f07Read 23 October 2026Specifications: THD <0.1% (@ 1 kHz, 100 dB SPL).

Max input power

Not available

500mW5Owner's manualla-bs.com/Objets/HD280PRO_me.pdfRead 23 October 2026Specifications: Long-term max. input power 0.5 W (as per IEC 268-7). Stored as 500 mW.11Retailer pagekirstein.de/en/Live-Studio/Headphones/HiFi-and-DJ-Headphones/Sennheiser-HD-280-Pro-2016.htmlRead 23 October 2026Rated power handling 500 mW. Bonedo and kopfhoerer.de give the same nominal rating of 500 mW. The maker's older manual (listed here) states 0.5 W long-term maximum input power.

Max digital audio sample rateiHighest supported digital audio sample rate over a USB cable or wireless dongle. This is not the microphone rate or acoustic frequency response.

Not available

Not available

Max digital audio bit depthiHighest published digital playback bit depth over a USB cable or wireless dongle.

Not available

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DAC

Not available

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Personalised soundiA manufacturer-supported hearing test or ear scan creates a device sound profile tailored to the listener. Generic equalizer adjustments do not count.

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact maker Personal Sound feature uses Audiodo to create a hearing profile through a three-minute test in Nothing X. The resulting profile is stored directly on the headphones and remains applied across connected devices. This is hearing-test personalization, separate from the manual three-band equalizer and Energy Slider.

Not available

Onboard EQiCustom playback EQ profiles stored in the headset and applied without the host app running. Note supported active connections. Receiver-only or software-only EQ does not count.

Not available

Not available

Custom EQ bandsiNumber of bands in the custom playback equalizer. Microphone EQ bands are excluded.

312Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact reviewer reports a three-band custom EQ in Nothing X. Firmware 1.0.1.40. No advanced Headphone (1) parametric EQ is transferred.

Not available

EQ presets

Pop, Rock, Electronic, Enhance Vocals, Classical20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact equalizer support article names five default profiles: POP, ROCK, ELECTRONIC, ENHANCE VOCALS, and CLASSICAL. Custom mode is not counted as a named preset. Marketing prose calls six preset EQs but does not name a sixth.

Not available

Volume limit

Not available

Not available

Spatial audio

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Spatial audio supportiNamed headset or host spatial-audio systems that the maker or reviewer explicitly supports. A platform feature may require compatible hardware, software or a separate licence.

Static Spatial Audio: Cinema mode, Static Spatial Audio: Concert mode1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly names Static Spatial Audio with Cinema and Concert modes. These are supported headphone processing modes. No Dolby license or dynamic head tracking is inferred.

Not available

Spatial audio licence includediA paid spatial-audio licence is bundled or embedded. Compatibility with a separately purchased app does not count.

Not available

Not available

Head tracking

Not available

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Noise cancelling

7 of 10 differ

Active noise cancelling

Yes5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact support article explicitly confirms Active Noise Cancellation.

No12Reviewrtings.com/headphones/reviews/sennheiser/hd-280-pro-2016Read 23 October 2026Public header: Noise Cancelling No. Closed-back, dynamic, wired. The measured results are member-only and were not used.

ANC typeiFeedforward uses outside microphones. Feedback uses inside microphones. Hybrid uses both. Voice-call noise filtering is separate.

Hybrid1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Noise Cancellation Type table states Hybrid ANC.

Not available

ANC microphonesiTotal microphones used for active playback noise cancellation across both sides. Do not substitute the total physical or voice microphone count.

Not available

Not available

Adaptive ANCiNoise cancellation automatically changes with the environment or fit. Manually choosing a level does not count.

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explains automatic movement between strong, moderate, and light cancellation based on surroundings. Adaptive is not counted as an extra manual strength level.

Not available

ANC levelsiNumber of adjustable cancellation strength steps. Off and transparency modes are excluded.

315Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact ANC discussion names Low, Mid, High, and Adaptive within ANC On. Only the three fixed strength levels are counted. Adaptive, Transparency, and Off are excluded.

Not available

ANC attenuation (claimed)

40dB5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact ANC support article states up to 40 dB. Frequency, weighting, and test method for this maximum are unspecified. The technical table also lists 2000 Hz as Frequency range, which does not establish a measurement frequency. The separate 99% marketing limit is not converted to dB.

Not available

Transparency mode

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker expressly documents Transparency Mode to hear surroundings.

Not available

Adjustable transparency

Not available

Not available

Conversation detectioniAudio pauses or lowers automatically when the wearer speaks. Voice assistant activation does not count.

Not available

Not available

Wind noise reduction

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Noise Cancellation Features table states Wind Noise Conduction Mesh. This is a physical mesh feature, not an inferred selectable wind-processing mode.

Not available

Measured

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Frequency response notesiMeasured by a reviewer, not claimed by the maker

Changing the bass slider from minimum to maximum increases low-frequency output. The reviewer reports upper-frequency roll-off above about 8 kHz.12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026SoundGuys compares minimum and maximum bass-slider responses against its preference curve. Firmware 1.0.1.40. Host and codec are unspecified. The reported approximately 8 dB slider difference is not converted into a target-relative averaged bass metric.

Fairly close to the SoundGuys preference curve. There is a dip between about 50 and 100 Hz and the sub-bass is slightly louder than ideal. The 2 to 8 kHz range is slightly under-emphasised and the response drops steeply above 10 kHz.13Reviewsoundguys.com/sennheiser-hd-280-pro-review-53109Read 23 October 2026SoundGuys measured response compared with its headphone preference curve. Review published 2022-04-05 and updated 2024-11-28. The page loads its graph dynamically, so the summary follows the written findings.

Bass amountiReviewer’s bass deviation from its stated target. Positive is more bass. Target and test method belong in the source note.

Not available

Not available

Treble amountiReviewer’s treble deviation from its stated target. Positive is more treble. Target and test method belong in the source note.

Not available

Not available

Deviation from targetiReviewer’s full-range error from its target curve. Do not substitute a regional bass or treble error.

Not available

Not available

Consistency between fittingsiReviewer’s standard deviation across repeated fittings. Test rig and fitting procedure belong in the source note.

Not available

Not available

Harmonic distortioniIndependently measured harmonic distortion, with test level and method in the source note.

Not available

Not available

Sound leakageiIndependently measured leakage at 30 cm. Playback level and method belong in the source note.

Not available

Not available

Measured noise isolationiIndependently measured attenuation. Positive values mean more noise reduction. ANC state, rig and frequency bands belong in the source note.

Not available

Not available

Noise isolation (measured, best)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

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Mic quality notesiMeasured by a reviewer, not claimed by the maker

Recorded calls remain intelligible, but speech sounds unnatural and includes some pops and crackles.12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact reviewer reports intelligible speech and noise rejection with some pops and crackles. Recordings cover ideal, office, street, wind, and reverberant conditions. Firmware 1.0.1.40. Host, codec, and call processing settings are unspecified.

Not available

Mic low-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic high-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic speech-to-noise ratioiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Measured latencyiEnd-to-end latency measured by a reviewer for a specific connection, platform and codec. Firmware, method and operating mode belong in the source note.

Not available

Not available

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

Not available

Not available

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

Not available

Not available

Measured battery lifeiReviewer’s continuous playback test. State the connection, ANC and lighting where known. Unknown settings stay omitted and are described in the source note.

ACMF Headphone Pro

ANC	Hours (h)
Yes	43.15
Yes	49.5

Source12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026First row: SoundGuys standardized test measured 43 hours 9 minutes with ANC on. Firmware 1.0.1.40, one-week supplied review unit. Connection, host, codec, playback level, and ANC strength are unspecified. Second row has a separate TechRadar source below.14Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026TechRadar depleted a full battery and measured 49.5 hours with ANC enabled during its four-week review. Its source devices include MacBook Pro, iPhone 15 Pro Max, and FiiO M15S, but the exact battery-test connection, codec, volume, ANC strength, and firmware are unspecified. The separate row is not pooled with SoundGuys.

BSennheiser HD 280 PRO

Not available

Battery life (measured, max)iMeasured by a reviewer, not claimed by the maker

49.5h=CalculatedFrom Measured battery life

Not available

Clamping forceiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Weight (measured)iIndependently weighed headset. A review that repeats the maker’s number does not qualify. Cable and microphone inclusion belong in the source note.

Not available

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Microphone

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MicrophoneiMain microphone used for speech. Secondary internal microphones may be described in the source note.

Built-in6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The controls and call documentation describe the on-headphone microphone, including its configurable on/off function. No detachable boom is supplied.25Reviewrtings.com/headphones/reviews/cmf/headphone-proRead 8 October 2026The exact public Office Work verdict explicitly describes an integrated microphone. No boom or in-line microphone is substituted.

None12Reviewrtings.com/headphones/reviews/sennheiser/hd-280-pro-2016Read 23 October 2026Public header: Mic No.

Microphone element

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Microphone pickup patterniUse the maker’s exact named pattern. Unidirectional does not establish whether the capsule is cardioid, supercardioid or hypercardioid.

Not available

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Voice microphonesiTotal microphones used for voice pickup or beamforming across both sides. ANC-only microphones are excluded.

31Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The feature table states a three-microphone ENC architecture for calls. Its separate five-microphone total is not substituted for this voice count or an unproven ANC count.

Not available

Total microphonesiEvery physical microphone across the headset, including call, ANC and calibration microphones. Shared microphones count once. Excludes microphones in charging cases or receivers, and vibration sensors. Use an explicitly published physical total, never a sum of overlapping role counts.

528Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact maker Noise Cancellation technical table explicitly states 5 MICS TOTAL. This is the complete physical headset total. The separate three-microphone ENC call architecture remains a voice-role count, and no ANC count is derived from those overlapping roles.

Not available

Mic frequency responseiAcoustic microphone response, not its digital sampling rate. Connection-specific ranges belong in the source note.

Not available

Not available

Mic sensitivityiPublished microphone sensitivity. Reference such as dBV/Pa or dBFS, frequency and distance belong in the source note.

Not available

Not available

Mic signal-to-noiseiPublished microphone signal-to-noise ratio. Minimum or typical conditions belong in the source note.

Not available

Not available

Mic sample rateiExplicitly published digital microphone capture or speech sampling rate. State the audio route in the source note, or say it is unpublished. Internal capture does not prove the effective rate on every connection. Acoustic bandwidth, playback rate and generic microphone-chip capability do not qualify.

Not available

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Mic noise reductioniProcessing that removes noise from transmitted speech. Playback ANC and a directional microphone alone do not count.

Not available

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Flip to mute

Not available

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Mute button

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The support controls list explicitly includes Mic on/off as an optional configurable button function on all platforms. This requires selecting the function in the app.

Not available

Mute indicatoriPublished indication of microphone mute. mechanical_marker is a visible physical marker showing the microphone's mute-switch position. LED options require an electronic light. The in-line controller option is for a mute light on a cable remote.

Not available

Not available

Sidetone

No13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact Don't buy section explicitly says the product lacks sidetone for hearing your own voice during calls.

Not available

Adjustable sidetone

Not available

Not available

Foam microphone windscreeniA foam cover for the voice microphone. An internal metal mesh pop filter does not count.

Not available

Not available

Connectivity

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Audio connectionsiConnections that carry playback audio. Charging or firmware USB alone does not count as USB audio.

Analog, Bluetooth5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Audio formats and wired connection articles document Bluetooth and analog AUX playback. USB-C is charging only.

Analog1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Connection Wired, connector 3.5 mm. Analog headphones with a coiled cable.

Analog source plugsiAnalog plug(s) supplied for the source device, including adapters. The headset-side jack is listed separately.

Not available

3.5 mm TRS, 6.35 mm1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Features: Industry-standard 3.5 mm plug with 6.3 mm adapter. Third-party listings describe the plug as a stereo plug.

Cable connector on headsetiConnection used by the playback cable at the headset. A fixed cable is not replaceable through a headset jack.

3.5 mm10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original guide expressly labels the left ear cup 3.5 mm Audio In.

Fixed cable7Retailer pagethomann.ie/sennheiser_hd_280_pro_new.htmRead 23 October 2026Replaceable cable: No.11Retailer pagekirstein.de/en/Live-Studio/Headphones/HiFi-and-DJ-Headphones/Sennheiser-HD-280-Pro-2016.htmlRead 23 October 2026The cable is not detachable.13Reviewsoundguys.com/sennheiser-hd-280-pro-review-53109Read 23 October 2026The left ear cup wire is not removable.

Longest included cableiLength of the longest supplied cable, including charging and dongle cables. Individual cable lengths are listed in Cables included.

1.2m1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker package inventory contains only the supplied 1.2 m analog cable. The reviewer's approximate 2.7-foot cable description does not override the manufacturer claim.

3m1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Coiled cable, min. 1.3 m / max. 3 m. The longest length when stretched is stored.

Headset USB plug or portiUSB plug or port on the headset or its included wired audio adapter. A charging-only USB port can appear here.

USB-C10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original English Quick Start Guide identifies USB-C Charge In on the right ear cup.

Not available

Audio over USB-C cableiPlayback through a USB-C cable or included wired USB-C audio adapter. A charging-only USB-C port does not count.

No5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact wired connection article expressly says 3.5 mm aux-in is supported and USB-C Audio is not.

Not available

Passive wired listeningiAnalog playback works with the headset powered off or its battery empty. An active analog converter that needs headset power does not count.

No13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact review explicitly states that wired 3.5 mm listening requires the headphones powered on and does not work passively.

Yes1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Battery included N. Wired passive dynamic headphones with no electronics.

Wireless receiveriDedicated wireless audio receiver or dongle. A wired USB sound card does not count.

Not available

None1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Wired headphones. The page lists only a wired connection.

Wireless receiver connectoriPhysical USB connector on the receiver. Supplied extension cables and adapters are explained in the source note. Both means two native connector types.

Not available

Not available

Wireless range (claimed)iMaker’s advertised wireless range. Connection and indoor or outdoor conditions belong in the source note. Measured distance is not stored here.

10m1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Connection range table states 10 m. Indoor or line-of-sight test conditions are not specified. The Tom's Guide generic Bluetooth 800-foot statement is excluded.

Not available

Bluetooth

5.45Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Bluetooth version article states Bluetooth 5.4.

Not available

Bluetooth codecsiNamed Bluetooth audio codecs supported by this exact model. Host, firmware and operating-mode restrictions belong in the source note.

SBC, AAC, LDAC5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Audio formats article expressly lists SBC, AAC, and LDAC. iOS lacks LDAC support according to the separate LDAC instructions.6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact LDAC instructions state 96 kHz, 24-bit, and 990 kbps for Bluetooth streaming with a compatible Android phone and high-quality audio enabled. Higher-bitrate LDAC recommends disabling Dual Connection. These limits apply to LDAC Bluetooth playback. The headset does not support USB-C cable audio.

Not available

LE AudioiLE Audio playback support. Bluetooth Low Energy for app control alone does not count.

Not available

Not available

AuracastiAuracast broadcast audio support. Required phone, firmware and app conditions belong in the source note.

Not available

Not available

Bluetooth multipointiCan remain connected to multiple Bluetooth source devices at once. Mixing Bluetooth with a proprietary dongle is a separate field. A maker's dual connection to two Bluetooth devices at once counts.

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact Dual Connection instructions document two simultaneous Bluetooth source connections with audio switching. This is disabled by default and requires enabling in Nothing X.

Not available

Multipoint devicesiNumber of Bluetooth source devices connected at once, not the number remembered for later pairing.

26Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The instructions repeatedly specify two connected devices. A third device can preempt one connection. This is not three simultaneous devices or pairing memory.

Not available

Paired devices remembered

Not available

Not available

Mixes 2.4 GHz and Bluetooth audioiPlays both wireless audio streams at the same time. Automatic switching or Bluetooth standby does not count.

Not available

Not available

Fast pairing

Google Fast Pair, Microsoft Swift Pair23Maker product pagesupport.nothing.tech/hc/en-us/articles/38910344910225-Does-CMF-Headphone-Pro-support-Google-Fast-PairRead 8 October 2026The exact product support article explicitly confirms the named quick-pairing feature. Google Fast Pair needs a compatible Android source. Microsoft Swift Pair is the Windows route. Neither adds USB audio.24Maker product pagesupport.nothing.tech/hc/en-us/articles/38910328918545-Does-CMF-Headphone-Pro-support-Mircosoft-Swift-PairRead 8 October 2026The exact product support article explicitly confirms the named quick-pairing feature. Google Fast Pair needs a compatible Android source. Microsoft Swift Pair is the Windows route. Neither adds USB audio.

Not available

Base station

Not available

Not available

Latency

2 of 2 differ

Low latency modeiA selectable mode intended to reduce audio delay. A low-latency connection without a distinct mode does not count.

Yes7Maker product pagesupport.nothing.tech/hc/en-us/articles/38910343614737-Does-CMF-Headphone-Pro-support-low-latency-modeRead 8 October 2026The exact support article confirms low-latency mode.

Not available

Claimed latencyiMaker’s claimed delay for the stated connection and mode. Minimum claims and host restrictions belong in the source note.

ACMF Headphone Pro

Connection	Mode	Latency (ms)
Bluetooth	Game Mode on Nothing Phone	120

Source7Maker product pagesupport.nothing.tech/hc/en-us/articles/38910343614737-Does-CMF-Headphone-Pro-support-low-latency-modeRead 8 October 2026The maker states less than 120 ms when connected to a Nothing Phone in Game Mode. The stored value is the upper bound of that claim, not a measured result. Codec and firmware are unspecified. Generic analog zero-latency reviewer prose is not stored as an end-to-end result.

BSennheiser HD 280 PRO

Not available

Compatibility

2 of 3 differ

Compatible platformsiPlatforms with a documented audio path. This does not imply every connection or microphone function works. Platform editions must be checked individually.

Android, iOS, Windows, macOS20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026Exact maker compatibility support names Android 6.0 or later and iOS 13 or later. Swift Pair support and exact SoundGuys setup instructions establish Windows Bluetooth. The exact Tom's Guide reviewer listened through the supplied analog cable on a MacBook Air M2. No console route is inferred from a physical jack.21Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026Exact maker compatibility support names Android 6.0 or later and iOS 13 or later. Swift Pair support and exact SoundGuys setup instructions establish Windows Bluetooth. The exact Tom's Guide reviewer listened through the supplied analog cable on a MacBook Air M2. No console route is inferred from a physical jack.

Not available

Connection per platformiOnly explicitly documented playback paths for the exact model. Microphone support is separate. Leave unknown microphone support omitted. An Xbox and a PlayStation edition of one headset can connect differently, so it is per variant.

ACMF Headphone Pro

Platform	Connection	Microphone works
Android	Bluetooth	Yes
iOS	Bluetooth	Yes
Windows	Bluetooth	Not available
macOS	Analog	No

Source20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026Android/iOS Bluetooth playback and voice calls are explicitly documented by maker compatibility and controls articles. Windows Bluetooth is documented by exact Swift Pair and reviewer pairing instructions. The exact Tom's Guide reviewer used analog playback on a MacBook Air M2 and explains that the supplied cable does not carry headphone microphone calls. Unknown Windows microphone behavior is omitted.21Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026Android/iOS Bluetooth playback and voice calls are explicitly documented by maker compatibility and controls articles. Windows Bluetooth is documented by exact Swift Pair and reviewer pairing instructions. The exact Tom's Guide reviewer used analog playback on a MacBook Air M2 and explains that the supplied cable does not carry headphone microphone calls. Unknown Windows microphone behavior is omitted.

BSennheiser HD 280 PRO

Not available

Official licence

Not available

Not available

Battery and charging

10 of 13 differ

Battery capacityiRated capacity of one headset battery. Do not use case, receiver or total multi-battery capacity.

720mAh4Maker product pagesupport.nothing.tech/hc/en-us/articles/38910303499409-What-is-the-battery-capacity-of-CMF-Headphone-ProRead 8 October 2026The exact support article states 720 mAh. The maker technical table agrees. Rated versus typical capacity is not specified. This is the headset battery, not a nonexistent case battery.

Not available

Swappable batteryiBattery can be exchanged by the user as part of normal operation. Service or recycling disassembly does not count.

No10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original English safety section expressly instructs users not to replace the battery themselves. Normal battery hot swapping is unsupported.

Not available

Batteries includediNumber of headset batteries supplied, including the one already installed.

Not available

Not available

Claimed battery lifeiMaker’s maximum playback time per stated connection, codec, ANC, spatial audio and lighting settings. Name the spatial processing mode and other conditions in the source note. Unknown settings stay omitted.

ACMF Headphone Pro

Connection	ANC	Codec	Hours (h)
Bluetooth	No	AAC	100
Bluetooth	Yes	AAC	50
Bluetooth	No	LDAC	70
Bluetooth	Yes	LDAC	38

Source2Maker product pagesupport.nothing.tech/hc/en-us/articles/38910279111569-What-s-the-battery-life-of-CMF-Headphone-ProRead 8 October 2026The exact support article separately names AAC and LDAC playback with ANC off/on. The current maker technical table matches all four rows at 50% volume. Nothing laboratory temperature is 25°C. The support footnote says AAC even beneath LDAC rows, so the explicitly labelled codec rows govern. Talk and standby durations are excluded. The copied product disclaimer erroneously states 50 hours with ANC off and is not used.

BSennheiser HD 280 PRO

Not available

Battery life (claimed, max)

100h=CalculatedFrom Claimed battery life

Not available

Battery life with ANC (claimed)

50h=CalculatedFrom Claimed battery life

Not available

Battery life without ANC (claimed)

100h=CalculatedFrom Claimed battery life

Not available

Charging port

USB-C10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original guide charging diagram identifies USB-C Charge In. Current exact support limits charging input to 5 W.

None1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Battery included N.

Full charge timeiPublished time to fully charge a depleted headset. In-use charging can take longer.

120min1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Charging table states Type-C wired charging to full in 120 minutes. The feature text says under two hours. The numeric table estimate is retained without using the copied case-related disclaimer.

Not available

Quick charge timeiCharge duration in the maker’s quick-charge claim. Read together with Quick charge playback.

5min3Maker product pagesupport.nothing.tech/hc/en-us/articles/38910318874897-Does-CMF-Headphone-Pro-support-fast-chargingRead 8 October 2026The exact current support article states a five-minute charge. The maker technical table agrees.

Not available

Quick charge playbackiPlayback gained from Quick charge time. Charger power, codec, volume and ANC conditions belong in the source note.

8h3Maker product pagesupport.nothing.tech/hc/en-us/articles/38910318874897-Does-CMF-Headphone-Pro-support-fast-chargingRead 8 October 2026Five minutes gives eight hours with ANC off or four hours with ANC on. The stored maximum is eight hours with ANC off, AAC, 50% volume, and 25°C laboratory temperature. Marketing prose and older announcements quote four or five hours without consistent ANC conditions and are excluded.

Not available

Use while charging

Not available

Not available

Charging dock or stand

Not available

Not available

Controls

5 of 6 differ

Controls

Buttons, Volume wheel, Slider6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The original guide and current support describe Power/BT and shortcut buttons plus a pressable Roller that controls volume. A separate physical Energy Slider adjusts bass or treble after selecting its tuning mode in Nothing X.

Not available

Volume control

Wheel6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact volume article states rolling the knob up/down adjusts playback volume.

Not available

Game and chat mixiBalances separate game and chat audio streams. Mixing Bluetooth and dongle source volume alone does not count. Supported platforms belong in the source note.

Not available

Not available

Remappable controlsiOn-device button, touch or dial functions can be reassigned. Changing EQ alone does not count.

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The support controls list provides optional button functions and bass/treble tuning for the Slider through Nothing X. Essential Space requires Nothing OS.

Not available

Wear detection

No15Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact specification table and design discussion explicitly state no wear detection.

Not available

Voice assistant

ChatGPT27Maker product pagesupport.nothing.tech/hc/en-us/articles/39520905948689-Why-can-t-I-use-ChatGPT-on-CMF-Headphone-ProRead 8 October 2026The exact CMF Headphone Pro support article documents a configurable button shortcut to ChatGPT Voice. Requires a compatible Nothing or CMF phone, current phone system and Nothing X app, an installed signed-in ChatGPT app, and prior use of ChatGPT Voice. This is phone-app integration, not an independent on-headphone assistant. Unnamed generic phone assistants are not converted into specific Siri or Google Assistant claims.

Not available

Comfort and build

7 of 11 differ

Headband type

Padded13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact design discussion describes cushioning across the headband and ear pads.

Padded3Owner's manualassets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f07Read 23 October 2026Replacing spare parts: Headband padding. The headband carries a replaceable padded cushion.8Retailer pagebhphotovideo.com/c/product/1320366-REG/sennheiser_hd_280_pro_closed.htmlRead 23 October 2026Description: adjustable padded headband.

Headband material

PU synthetic leather and memory foam13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact design section describes polyurethane synthetic leather and memory foam across the headband and ear pads. Steel reinforcement is independently identified by maker support.

Not available

Frame material

ABS plastic shell, PA+GF sliding arms, stainless steel headband strips8Maker product pagesupport.nothing.tech/hc/en-us/articles/38910349693841-What-material-is-the-outer-casing-of-CMF-Headphone-Pro-made-ofRead 8 October 2026The exact material article identifies ABS shell, PA+GF sliding arms, and stainless steel headband strips. The SoundGuys all-plastic description does not override these published internal reinforcement materials.

Polycarbonate1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Features: Rugged polycarbonate construction. Made to Travel: Built from tough polycarbonate.

Ear cup material

Not available

Plastic14Spec databasesoundguys.com/product/sennheiser-hd-280-proRead 23 October 2026Spec table: Chassis material Plastic. Bonedo also says the housing is entirely plastic.

Ear pad material

PU leather with high-resilience memory foam9Maker product pagesupport.nothing.tech/hc/en-us/articles/38910322756881-What-material-are-the-ear-cushions-of-CMF-Headphone-Pro-made-ofRead 8 October 2026The exact cushion material article specifies polyurethane synthetic leather covering and high-resilience memory foam fill.

Leatherette8Retailer pagebhphotovideo.com/c/product/1320366-REG/sennheiser_hd_280_pro_closed.htmlRead 23 October 2026Description: thick, padded leatherette earcups.

Replaceable ear pads

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker states that cushions twist on and off for cleaning and replacement. Optional colored cushions are sold separately.

Yes1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Features: Soft, replaceable earpads. A pad set (2016+, article 572235) is listed as a spare part.

Ear pad attachmentiHow a replacement ear pad attaches to the ear cup, not how the decorative outer cover attaches. A press-fit or snap-on pad counts as clip.

Twist lock1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker describes twisting cushions on and off. Exact SoundGuys review confirms the rotating attachment. This is a twist-lock attachment rather than a clip or magnetic mount.

Clip3Owner's manualassets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f07Read 23 October 2026Replacing spare parts, Ear cushions: the drawing shows the pad pulled off the cup and pressed on around its rim. A press-fit pad counts as clip.

Ear pad openingiUsable opening inside an ear pad, excluding the outer cushion. Depth is the internal space between pad surface and driver cover.

Not available

Not available

Ear tips included

Not available

Not available

Dust and water rating

IPX220Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Water/dust resistance support article states IPX2 under IEC 60529. There is no certified dust protection. The TechRadar no-IP-rating claim is contradicted by the maker and is not used.

Not available

User-replaceable parts

Ear cushions1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly permits swapping and cleaning the ear cushions. The original manual prohibits user battery replacement.

Ear pads, Headband padding3Owner's manualassets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f07Read 23 October 2026Replacing spare parts: Headband padding and Ear cushions. The spare pad set (article 572235) contains both ear cushions and a headband cushion.

Software

3 of 3 differ

Companion app

Nothing X1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The Nothing X app section names Nothing X.

Not available

App platforms

Android, iOS1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker app section expressly says Android and iOS. Individual features have phone, OS, and app requirements.

Not available

User firmware updates

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker app section documents firmware update management.

Not available

Dimensions and weight

1 of 2 differ

Headset weightiPublished headset mass without detachable cable or microphone when stated. A fixed cable remains included. Any unqualified maker weight is identified in the source note.

283g(10 oz)1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Headphones weight table states 283 g. This is the maker claim. Cushion weight is a separate 45 g entry with unspecified quantity scope and is not added to headset mass.

285g(10.1 oz)1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Tech specs: Product weight 285 g. Features: 285 g without cable.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Specifications: Weigth (w/o cable) 285 g. The spec sheet also states a contact pressure of 6 N and a sound pressure level of 113 dB, which have no field here.

Headset dimensionsiBody size with headband upright and ear cups in their normal wearing position. Width is across the head, height is top to bottom, and depth is front to back. Folded or flat-swivel dimensions are not substituted.

Not available

Not available

Certifications

2 of 3 differ

Hi-Res Audio

Hi-Res Audio, Hi-Res Audio Wireless1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker expressly claims wired and wireless Hi-Res certifications. Wireless high-resolution playback requires a compatible LDAC source.

Not available

Communication certifications

Not available

Not available

FCC ID

2AZEQ-B17510Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original regulatory document identifies exact FCC ID 2AZEQ-B175. Radio transmit power is not treated as audio amplifier power.

Not available

Other certifications

EU RED 2014/53/EU, EU RoHS 2011/65/EU and 2015/86326Maker spec sheet (PDF)s3.zoommer.ge/site/certificate/nothing-cmf-headphone-pro.pdfRead 8 October 2026English declaration page 2 lists RED 2014/53/EU and RoHS 2011/65/EU and 2015/863. These are maker declarations for B175, not inferred Bluetooth SIG or extra market-availability claims.

EU RoHS Directive 2011/65/EU, UK RoHS Regulations 2012, WEEE Directive 2012/19/EU4Owner's manualassets.sennheiser.com/download/assets/PRO_HEADPHONES_HEADSETS_Safety_Guide_07_2025.pdf/1ffe0066e7d811f0aabe2a34179bc91dRead 23 October 2026Safety guide for PRO headphones, which lists the HD 280 PRO. It gives an EU declaration of conformity to the RoHS Directive (2011/65/EU), a UK declaration of conformity to the RoHS Regulations (2012) and WEEE disposal information under Directive 2012/19/EU.

In the box

3 of 3 differ

In the box

CMF Headphone Pro, Carry pouch, User guide, Safety and warranty information, 3.5 mm to 3.5 mm audio cable (1.2 m)1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact In the box table lists the headset, pouch, guide, safety/warranty information, and one 1.2 m analog cable. No USB charging cable or wall charger is listed. Exact TechRadar review independently confirms both omissions.

HD 280 PRO headphones, 3.5 mm jack plug to 6.3 mm adapter, Safety guide1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026What's in the box: (1) HD 280 PRO Headphones, (1) 3.5 mm jack plug to 6.3 mm adapter, (1) Safety guide.2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Delivery includes: HD 280 PRO Monitoring Headphone, 3.5 mm jack plug to 6.3 mm adapter, Safety Guide.

Cables includediSupplied playback, charging, dongle and adapter cables. A permanently attached headset cable is included and named as fixed.

ACMF Headphone Pro

Type	Length (m)	Count
3.5 mm to 3.5 mm audio cable	1.2	1

Source1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact package table lists one 3.5 mm to 3.5 mm audio cable, 1.2 m long. No charging cable is supplied. Contact arrangement is not inferred from nominal plug size.

BSennheiser HD 280 PRO

Type	Length (m)	Count
Coiled single-sided cable, permanently attached	3	1
3.5 mm jack plug to 6.3 mm adapter	Not available	1

Source1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026Single-sided coiled cable is part of the headphones. The 3.5 mm to 6.3 mm adapter is in the box.

Carrying caseiSupplied carrying case or pouch. A retail carton does not count as a carrying case.

Soft22Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The maker box table supplies a Carry Pouch. Exact SoundGuys and TechRadar reviews explicitly describe a cloth/fabric travel bag. This is a soft pouch, not a hard case.

None1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026The box contents list has no case or pouch.

Links

Not compared

Product page

us.nothing.tech/products/cmf-headphone-pro1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact US Dark Grey selector and public variant payload identify this reference. No Headphone (1) or Headphone (a) values are transferred.

www.sennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-5068451Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026

Spec sheet

us.nothing.tech/products/cmf-headphone-pro1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The public page payload contains labelled technical specification tables. No separate exact maker datasheet was found. These tables were read from the normally downloaded page HTML.

www.sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdf2Maker spec sheet (PDF)sennheiser.com/globalassets/digizuite/40985-en-hd_280_pro_product_specification_en.pdfRead 23 October 2026Product specification V1.0, one page, article no. 506845.

Manual

fccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdf10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original 44-page manufacturer FCC exhibit combines safety/warranty information with the multilingual Quick Start Guide. Cover explicitly identifies model B175. This is not a generated third-party manual.

assets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f073Owner's manualassets.sennheiser.com/download/assets/HD_280_Quick_Guide_05_2016.pdf/17fabe52e7b711f0a866ce3d75c40f07Read 23 October 2026Quick Guide, document 566630/A02 dated 04/16.

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

Not available

Not available

Warranty

1 of 1 differ

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

1year19Maker product pageus.nothing.tech/pages/terms-of-salesRead 8 October 2026Current US Terms of Sale section 6.8 gives headphones twelve months of limited warranty. This covers the original US maker-store purchase. Statutory rights and other regions are separate.

2years1Maker product pagesennheiser.com/en-us/catalog/products/headphones/hd-280-pro/hd-280-pro-506845Read 23 October 2026US page: Warranty (years) 2. The safety guide also gives 24 months for Australia and New Zealand.

Both are also in the API. Back to all headsets and headphones.