We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 7 min read · Independent comparison
If you want longer battery life and a lighter everyday open-ear headphone for running and workouts, choose MZYDM Bone Conduction Headphones; if you need a headphone you can actually wear in the pool with built-in music storage, choose Kethmeva Swimming Headphones. Both use bone conduction drivers in an open-ear hook design, but they solve two different problems. One is built around all-day comfort and long wireless listening. The other is built around water.
• MZYDM's biggest strength: 15 hours of playtime, a 29g flexible hook frame, and Bluetooth 5.4 with a 15-meter range — a comfortable, light daily driver.
• MZYDM's biggest trade-off: IPX6 sweat resistance only. The manufacturer states it is not suitable for swimming, so the pool is off the table.
• Kethmeva's biggest strength: IP68 waterproofing rated to 2 meters of immersion, plus 32GB of built-in memory so you can swim with music without any wireless signal.
• Kethmeva's biggest trade-off: 8 hours of playback per charge and a 10-meter Bluetooth range — and Bluetooth cannot pass through water, so you must switch to MP3 mode underwater.
• Who MZYDM is for: runners, gym-goers, and anyone who wants a lightweight open-ear headphone they can wear through a long workday.
• Who Kethmeva is for: lap swimmers, divers, and water-sport athletes who want music in the pool and a memory-based player for training.
The MZYDM set is the more conventional of the two, and that is meant as a compliment. It runs Bluetooth 5.4, which the spec sheet credits with faster pairing, a more stable connection, and lower latency. The wireless range is listed at 15 meters, which is generous enough that you can leave your phone on a bench and still keep the signal while moving around a gym floor or a track.
Battery is the headline number here: 15 hours of music and calls. That is the kind of figure that gets you through several workouts, or one very long day of podcasts and meetings, without reaching for a charger. Multi-point connection is also on board, so the headphones can hold two devices at once — the spec sheet describes taking a call on your phone while music pauses on your laptop. In practice that means fewer moments of fumbling between devices.
Who should buy it: anyone who wants a daily open-ear headphone for workouts and running, values a long 15-hour battery, and wants the freedom to move around without a phone in their pocket. The IPX6 rating handles sweat and weather, so it is a sensible training partner.
Who should skip it: swimmers. The manufacturer is explicit that it is not suitable for swimming, and IPX6 is a splash-and-sweat rating, not an immersion rating. If your workout happens in a pool, this is the wrong tool. Also skip it if you want the absolute maximum in noise isolation — noise control is listed as none, which is the whole point of open-ear design.
Kethmeva Swimming Headphones: Who It's For
The Kethmeva headphone exists for one reason: water. Its IP68 rating is certified for full immersion up to 2 meters, and the brand describes it as compatible with swim caps, goggles, and earplugs. That combination of features is what separates it from a standard sports headphone.
The clever part is the 32GB of built-in memory. Because Bluetooth signals do not travel well through water — the manufacturer notes that water blocks the transmission — you switch to MP3 mode when you go under. With roughly 8,000 songs of storage, you load your library onto the headphone itself and swim without carrying or pairing anything. That is the feature that makes this a genuine swimming headphone rather than a waterproof one that happens to survive a splash.
Battery life is listed at 8 hours of continuous playback, with a 2-hour charge time via magnetic charging. Bluetooth 5.4 is present for dry-land use, with a 10-meter range. The open-ear hook design uses soft, skin-friendly silicone cushions, and the point of the open fit is awareness — you keep hearing your surroundings, which matters when you are running or cycling near traffic.
Controls are push-button with a volume control, and the layout is built around a multi-function button that switches between the two modes and handles play/pause, track skipping, and calls. The enclosure is ABS, the color is black, and a 2.5mm jack is listed in the connectivity details.
Who should buy it: swimmers first, but also anyone who wants a memory-based MP3 player built into their headphone for training sessions where they would rather not carry a phone at all. Cyclists and gym users get the open-ear awareness benefit too.
Side-by-Side: Which Should You Choose?
• Best for battery life → MZYDM Bone Conduction Headphones. 15 hours versus 8 hours is a big gap for everyday use.
• Best for swimming → Kethmeva Swimming Headphones. IP68 with 2-meter immersion is the only one of the two rated for the pool.
• Best for wireless freedom around the house or gym → MZYDM Bone Conduction Headphones. A 15-meter Bluetooth range beats 10 meters, and multi-point connection keeps two devices linked.
• Best for training without a phone → Kethmeva Swimming Headphones. 32GB of built-in memory means your music lives on the headphone.
• Best for all-day comfort → MZYDM Bone Conduction Headphones. 29g and a flexible frame that bends freely is built for long wear.
• Best for water sports in general → Kethmeva Swimming Headphones. Diving, lap swimming, and water workouts are explicitly in scope.
• Best for hearing your surroundings while running or cycling → either one. Both use an open-ear hook design with no noise control, so traffic and voices stay audible.
• Best for a simple button layout → either one. Both use physical buttons rather than touch, which is easier to operate mid-workout.
If I had to pick one, I would buy the MZYDM Bone Conduction Headphones — but only because my workouts are on land. The 15-hour battery, 29g weight, and 15-meter Bluetooth range make it the better everyday headphone, and I would rather have the longer runtime than waterproofing I would never use. That said, if you swim, my recommendation flips completely. The Kethmeva is the only one of the two you can take underwater, and its 32GB of built-in memory solves the Bluetooth-through-water problem in a way no amount of battery life can. Decide where you sweat first; the answer follows from there.
FAQ
how to bone conduction earphones work
Bone conduction drivers vibrate and send sound through the bones of your skull to your inner ear, bypassing the ear canal. That is why both of these sit outside your ear on a hook rather than inside it. The result is open ears: you hear your music and your surroundings at the same time.
how to use bone conduction earphones
how to wear bone conduction earphones
Hook the transducers over the tops of your ears so the pads rest against your cheekbones, just in front of your ears. Both models use a flexible hook design, and the Kethmeva adds soft silicone cushions. They should feel light and stable, not pressed hard against your head.
how are bone conduction earphones different from regular earbuds
Regular earbuds seal or sit inside your ear canal, which blocks outside sound. Bone conduction leaves the canal open, so you stay aware of traffic, voices, and poolside whistles. The trade-off is less isolation and less bass punch, which is exactly why swimmers and outdoor runners tend to prefer them.
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