How to Read a Wireless Headphone Spec Sheet

Wireless headphone spec sheets are short, and the few numbers they carry come with conditions that change their meaning. A battery figure depends on whether noise cancelling and spatial audio are on. A quick-charge claim is a ratio, not a fact about the battery. A codec list tells you which phones will sound their best. This guide reads those figures on two makers' own product pages, the Bose QuietComfort Headphones (2nd Gen) and the Sennheiser MOMENTUM 4 Wireless, checked October 10, 2026. Sony's US and regional spec pages could not be read when this note was written, so no Sony figures appear. Where a page omits a number, the guide says so.

Read the battery figure with its conditions attached

Bose publishes two numbers for one battery. The QuietComfort Headphones (2nd Gen) page states "Up to 24 hours (18 with Immersive Audio)." Turning on the spatial audio mode costs a quarter of the runtime.

Sennheiser publishes one: "Up to 60 hours (with ANC on)," per the MOMENTUM 4 Wireless page. That is two and a half times the Bose figure under the comparable condition, and the page gives no separate figure for ANC off.

Neither page states the volume level, the codec or the source device behind its figure. Bose's footnote says its battery figures depend on settings and usage. That caveat applies to every maker whether or not they print it, and a figure without a stated condition should be read as the best case.

The reading rule: compare battery figures only under the same condition, usually ANC on. A sheet that gives one number for ANC on and another for a spatial or immersive mode, as Bose does, is telling you more than a sheet with a single large number.

Translate the quick-charge claim into a ratio

Quick-charge claims are the most marketing-shaped number on the sheet. Bose states "Quick Charge 15 min = 2.5 hrs" and a full charge time of 3 hours. Sennheiser states "Up to 6 hours from 10 min charge" and does not list a full charge time on the page read.

Divide to compare. By editorial calculation, Bose delivers 10 minutes of playback per minute of charging; Sennheiser delivers 36 minutes per minute. Part of that gap is the larger Sennheiser battery and part is charging rate, and the sheets do not separate the two.

Full charge time is the figure that matters for overnight use; Bose publishes it and Sennheiser does not. The quick-charge figure matters for the ten minutes before a flight. Decide which situation you are in before weighting either number.

• Bose QC Headphones (2nd Gen): 24 h, 18 h with Immersive Audio, 15 min charge = 2.5 h, 3 h full charge, $359.00.
• Sennheiser MOMENTUM 4: 60 h with ANC on, 10 min charge = 6 h, full charge time not listed, $229.95 on sale from $299.95.
• Both figures as listed on the makers' US product pages on October 10, 2026.

Check the codec list against the phone you own

The codec list is the spec most buyers skip and the one that decides whether a phone sends the headphones its best signal. Sennheiser lists "aptX Adaptive, AAC, SBC." Bose's product page names no codecs at all.

The pairing matters. iPhones use AAC and do not support aptX. Many Android phones support aptX Adaptive, and some support other high-bitrate codecs instead. A codec on the headphone sheet that the phone cannot send is a line of text, not a feature you will hear.

A missing codec list, as on the Bose page, usually means SBC and AAC only. That is adequate for an iPhone and a step down for an Android phone that can send aptX Adaptive. Ask the maker before assuming; the page read on October 10, 2026, did not say.

Treat the codec row the way you would treat a filter row on an appliance sheet: it is only useful once you know what the rest of your setup supports. The same point about matching the spec to the home it lands in runs through how to read an air purifier spec sheet.

Read Bluetooth version, multipoint and microphones as a set

Bose lists Bluetooth 5.4 and states the headphones "maintain a connection to two devices at the same time." Sennheiser lists Bluetooth 5.2 and does not mention multipoint on the page read.

The version number alone says little about sound. It governs range, power use and which newer Bluetooth audio features are possible. Multipoint is the feature a laptop-and-phone user will notice daily, and a sheet that omits it should prompt a question to support before purchase.

Microphone count is a call-quality proxy. Bose states 6 microphones. Sennheiser's page does not state a count. More microphones generally help wind and background rejection, but the count is not a measurement of call quality, and neither page publishes one.

Read the three rows together. A sheet with a recent Bluetooth version, stated multipoint and a stated microphone count, as Bose's is, was written by someone expecting comparison. A sheet with only the version number leaves two daily-use questions open.

Find driver size, weight and warranty before the price

Sennheiser lists a 42 mm dynamic driver; Bose does not state driver size. Driver diameter does not predict sound quality on its own, and a sheet that leads with it is selling a number rather than a result. Its absence on the Bose page is not a mark against the product.

Weight is comfort over hours. Bose lists 0.507 lb for the "Entire Product System" without a headphone-only figure. Sennheiser's page lists no weight. Both makers leave a buyer to guess the thing they will feel most, which makes the return window the only comfort test.

Warranty and returns are stated most clearly by Bose: "Bose products come with a 1-year warranty from the date of purchase," with purchases direct from Bose returnable within 30 days of receipt. Paid protection plans are listed at $49.95 for two extra years and $59.95 for a three-year accident plan.

Sennheiser states "Includes 1-year manufacturer warranty + free expedited shipping." Its return window sits on a separate webstore returns policy page not read for this guide. One year is the standard for both, and neither page describes battery replacement terms.

Prices as listed on October 10, 2026: Bose $359.00, Sennheiser $229.95 reduced from $299.95. The sale price is a snapshot; the regular price is the one to compare. The mix of published and missing figures matches the pattern in how to read a standing desk spec sheet: each maker publishes the figures it wins on.

Frequently asked questions

How long do noise-cancelling headphones last on a charge?

It depends on the mode. Bose lists up to 24 hours, or 18 with Immersive Audio, for the QuietComfort Headphones (2nd Gen). Sennheiser lists up to 60 hours with ANC on for the MOMENTUM 4 Wireless. Both figures are from the makers' US pages as of October 10, 2026.

Does the codec on the spec sheet matter?

Only if your phone sends it. iPhones use AAC, so the aptX Adaptive on the Sennheiser sheet is unused with an iPhone. Android support varies by model. Bose's page lists no codecs, which usually means SBC and AAC only; confirm with the maker.

What does a quick-charge claim actually mean?

It is a ratio of playback gained to minutes charged. Bose states 15 minutes for 2.5 hours; Sennheiser states 10 minutes for 6 hours. By editorial calculation that is 10 and 36 minutes of playback per minute of charging. Bose lists a 3-hour full charge; Sennheiser lists none.

How long is the warranty on Bose and Sennheiser headphones?

One year from purchase for both, per their product pages checked October 10, 2026. Bose adds a 30-day return window for direct purchases and sells extended protection at $49.95 or $59.95. Sennheiser's return terms are on a separate policy page.

Bottom line

A complete wireless headphone spec sheet states battery life with ANC on and off, full charge time, a codec list, Bluetooth version, multipoint, microphone count, weight and a warranty term. As of October 2026 neither page read states all of them: Bose omits codecs, driver size and a headphone-only weight; Sennheiser omits full charge time, multipoint, microphone count and weight.

Compare battery only under the same condition, match the codec list to your phone, and treat quick-charge as a ratio. Confirm the missing figures by email and lean on the return window for comfort and call quality. Every figure above is from the two pages on October 10, 2026, and makers revise them without notice.

The same discipline applies to the fragrance machines in how to read a scent diffuser spec sheet: a missing number is information, and it should lower your confidence in the headline claim beside it.