Sayrelances B10: How Bone Conduction Bypasses Your Ear

Bone conduction headphones are usually sold with a story about vibration and bones. The mechanism underneath deserves a proper explanation, because it tells you why these headsets behave the way they do once you start moving.

Ludwig van Beethoven, already losing his hearing, is said to have pressed a wooden rod against his piano and bitten down on it so he could feel the notes through his jaw. The anecdote may be embellished, but the route it describes is genuine. Sound can reach the inner ear through the skull without ever entering the ear canal.

That route is the working principle behind the sayrelances B10 Bone Conduction Headphones, an open-ear model catalogued under ASIN B09VSPT1NC and built around a wrap-around band instead of an earpiece. Every figure below comes from the listing for the sayrelances bone conduction headphones, from the standard behind the claim, or from a second source, and I flag it when they disagree.

Why bone conduction skips the ear canal

Normal hearing is an air path. Sound waves move through the air, the outer ear funnels them into the ear canal, and they strike the eardrum, which begins to move. Three small bones in the middle ear, the malleus, incus and stapes, pass those movements along and amplify them on the way to the cochlea. Inside the cochlea, hair cells turn the mechanical motion into nerve signals the brain reads as sound.

Bone conduction takes a shortcut around the first half of that chain. A transducer presses against the skull and shakes it directly, so the vibration reaches the middle ear and the cochlea without the eardrum doing the work. The outer ear and the ear canal are simply bypassed.

The practical consequence is that your ear canal stays open. Nothing is plugged and nothing is sealed, so the sounds around you keep arriving while music plays. On this model the transducer pads are the parts that do the work, which is why the fit section later matters more than the spec line.

What the vibration path touches

The contact point matters more than most product pages admit. This headset presses its pads against the cheekbone, just below and in front of the ear, roughly where the arms of a pair of glasses rest. Riders who wear glasses sometimes need to shuffle the fit slightly so both the frames and the pads stay comfortable.

From there the vibration crosses the temporal bone and reaches the ossicles. Because the signal is mechanical rather than airborne, it carries very little bass. Low frequencies need a large volume of moving air, and a pad pressed against bone cannot move much air at all. Expect the sub-bass to be absent rather than merely quiet. The mids are the range a bone driver can still move, which is why speech survives on this format while drums lose their weight. For an open-ear pair near $26, thin sub-bass comes with the territory.

What IP54 certifies once you start sweating

Ingress protection codes are read as two digits after the letters IP. The first digit covers solids and the second covers liquids, so IP54 means dust protection at level 5 and water protection at level 4. That exact rating appears on the sayrelances bone conduction headphones listing.

Level 5 for solids is described in the standard as dust protected. Dust is not entirely kept out, but not enough of it gets in to interfere with the device working. Level 4 for water is splashing water, meaning water hitting the enclosure from any direction has no harmful effect. That combination covers sweat, rain and splashes from a bottle, and in practice it is the second digit that decides whether a sweaty session ends with a working headset.

You will also see IPX4 on competing headsets, and the gap is smaller than the numbering suggests. The X means the manufacturer has not certified a dust digit at all. The water digit is still 4, so the splash behaviour is identical; the dust claim is simply absent. A headset rated IP54 has made one extra commitment rather than a different water promise.

What none of these ratings cover is immersion. Neither IP54 nor IPX4 survives being submerged, so neither one is a swimming rating. If you want to swim with a headset, you need IPX7 or IP68, and both of those are different tests again. The B10 is a splash headset, not a pool headset.

31 g and a frame that bends without deforming

The archived listing for this model puts the weight at 0.07 pounds, and the vendor's own feature graphic states 31 g. The two figures line up, which is a good sign, because marketing weights and listing weights often do not.

That is light enough to forget about during a session, but the more useful detail is the frame material. It uses a memory titanium alloy, and the vendor claims it can be bent through 360 degrees without taking a permanent set.

Why the B10 band, not the gram count, keeps the pads seated

Weight tells you how a headset feels on the way out of the box. The band tells you whether it still feels that way at mile four. On the B10 the titanium band wraps behind the head and holds the pads against the cheekbone; once that band loosens, volume drops and the sub-bass disappears first. A frame that springs back after 360 degrees of bending keeps the clamp point stable, which matters more than a few grams saved on a spec line.

Weight in this category runs between 23 g and 32 g across the open-ear models we checked, on Amazon listings and on the two review sites. Those differences are small in absolute terms, so fit stability rather than the gram count decides whether a headset still feels comfortable at the end of a long run.

The battery arithmetic behind a 230 mAh cell

The cell is rated at 230 mAh, and the listing claims 8 hours of playback at 70 percent volume. Divide one by the other and you get a drain of roughly 29 mAh per hour at that setting, which is believable for a small headset driving a vibration transducer rather than a speaker cone.

What 230 mAh buys the B10 on a two-hour run

A two-hour run uses a quarter of the rated 8 hours, so the B10 covers four sessions of that length before it needs a cable. The 10-day standby figure matters if you leave it in a bag between runs. When the cell is flat, 15 minutes on USB-C is quoted to buy 1 hour of playback, which is the number that decides whether you can still take a call on the way home.

Two caveats are worth carrying. The first is the volume figure, because most headsets are measured well below maximum and 70 percent is a moderate setting. Push the volume up and the runtime falls; that is physics rather than a defect. The second is what counts as playback, since music and phone calls are not equally demanding, yet the vendor quotes the same 8 hour figure for both.

The full charge time is less settled.

The vendor material disagrees with itself on charging time. The feature panel gives 1.5 hours, the feature bullet gives 2 hours, and the product description gives 2.5 hours. Plan on 2.5 hours and treat anything faster as a bonus.

Where Bluetooth 5.0 still holds up

This headset uses Bluetooth 5.0, and it is fair to ask whether that is still adequate. Newer open-ear models have moved to Bluetooth 6.0, and at least one of them lists a 60 ms latency figure.

For music and podcasts, version 5.0 is fine. Codec support and practical range have not changed much for this use case, and the phone in your pocket sits within a metre of your head. Where 5.0 shows its age is latency. If you watch video with a noticeable audio delay, or play games, a newer radio helps.

Multipoint pairing is the feature that matters more day to day. The B10 holds two devices at once, so a call on your phone interrupts audio from a laptop without you re-pairing anything. That capability is listed on this model, and it is a real convenience for anyone who moves between a computer and a phone.

What an open ear gives up

Open-ear design is a trade rather than a free upgrade. You gain awareness and comfort, and you give up isolation and bass.

The isolation point is obvious. On a busy road you hear traffic, which is exactly why cyclists and runners choose this format. The same property means you hear traffic on a train, a colleague calling your name, and every other sound in the room. If you want to block the world out, I would look at a sealed pair instead.

Bass is the second cost. Vibration transducers cannot move the volume of air a sealed driver can, so the sub-bass comes out thin and the mids carry most of what is left. Some headsets also leak sound outward at high volume as the transducer works harder.

Leakage deserves a thought if you share an office. A well-sealed in-ear pair keeps your music to yourself, while an open-ear headset at high volume does not always manage that. That is the point where I would shelve the idea of using one at a shared desk.

Matching the fit to the activity

Running suits this format well. The B10 band sits over the ears and behind the head, and the design keeps the pads in place through the bounce of a stride. Sweat is the main stress, and IP54 covers it.

Cycling is the classic use case, since hearing traffic counts as a safety feature rather than an inconvenience. A helmet strap can interfere with the band, so check that the two coexist before committing to a long ride.

Driving works as well. An open ear keeps you aware of horns, sirens and the engine, and a built-in microphone handles calls without you holding anything.

Swimming is the exception. IP54 is a splash rating, and no amount of careful drying turns it into a submersion rating.

What to check before you buy an open-ear pair

Four things decide most of the experience, and all four are printed on the listing if you know where to look.

The ingress rating tells you what the headset survives. Read the second digit for water and the first digit for dust, and treat the X in an IPX rating as a missing dust claim rather than a weaker water rating.

The weight and frame material tell you whether the fit will hold. Anything between the low 20s and low 30s of grams is normal, and a memory metal frame that springs back is worth more than a few grams saved.

The battery figure tells you the runtime, but only alongside the volume it was measured at. A headline of 10 hours at 50 percent volume and 8 hours at 70 percent volume can describe similar cells.

The radio version tells you the latency floor and little else that matters much. Bluetooth 5.0 is adequate for audio, and if you need low-latency video you should look for a newer version.

The price sits outside the four figures. Pricing on the sayrelances bone conduction headphones is $25.99 against a $32.99 retail price, and 608 buyers average 3.8 out of 5, with 23 answered questions on the page. Read the price and the rating as context for the four checks, not as a recommendation. The catalog record used for this piece listed them as out of stock at the time of the lookup, so check availability before you count on the price.

None of this makes bone conduction a compromise for everyone. The sayrelances pair is a specific tool: a headset for people who want music without giving up the sound of the world around them. If it is in stock, buy them for the road and the treadmill, and look elsewhere if you want isolation. I would treat them as a daily driver for outdoor work and nothing else.