We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 6 min read · Independent comparison
If you want a pair you can actually wear in the pool and leave your phone behind, choose POLVCDG Swimming Headphones; if you need longer battery life, lighter weight and a more affordable everyday training partner, choose MZYDM Bone Conduction Headphones.
• POLVCDG biggest strength: IPX8 waterproofing plus 32GB of built-in storage, so you can swim and listen without a phone nearby.
• POLVCDG biggest trade-off: Heavier at 32g, Bluetooth doesn't work underwater, and ANC/touch controls are less predictable with wet hands.
• MZYDM biggest strength: 15 hours of playtime, just 29g on your head, and a 15m Bluetooth range that stays stable indoors and out.
• MZYDM biggest trade-off: IPX6 only means sweat and rain resistance — it is explicitly not for swimming.
• Who POLVCDG is for: swimmers, triathletes, and anyone who wants phone-free music in the water.
• Who MZYDM is for: runners, gym-goers, and cyclists who want a light, long-lasting open-ear headphone for dry training.
The POLVCDG is built around one job: surviving water. Its IPX8 rating means it can be submerged up to two metres for an hour, which is a genuinely different class of protection from splash resistance. If you swim laps, this is the feature that matters most, because most open-ear headphones die the first time they get fully soaked.
The second big feature is the 32GB of onboard memory. That storage holds roughly 8,000 songs, which turns the headphone into a standalone MP3 player. That matters because Bluetooth signals can't travel through water — POLVCDG is upfront about this, and it's why the MP3 mode exists. You load your music, leave your phone in the locker, and swim. The 10-hour battery covers multiple sessions before you need to charge, and the 16mm bone conduction drivers with a 20Hz–20,000Hz range handle a normal music library fine.
On land it's still a capable open-ear headphone: Bluetooth 5.4, a flexible titanium frame coated in skin-friendly material, and 360° awareness so you hear traffic while running or cycling. Calls get environmental noise cancellation and a built-in mic.
MZYDM Bone Conduction Headphones: Who It's For
The MZYDM takes the opposite approach. Instead of chasing water, it chases endurance and comfort. Fifteen hours of playtime on a single charge is the headline number, and for a runner training most days of the week it means charging roughly once every week or two rather than every couple of days.
At 29g it's the lighter of the two, and the flexible hook-style frame can be bent freely, so it conforms without pinching. The 15mm drivers, 96dB sensitivity and 50-ohm impedance give it a slightly different audio character — more resistance means it wants a bit more power from your source, but the sensitivity is high enough that phones drive it comfortably. Bluetooth 5.4 keeps pairing quick and latency low, and the 15-metre range is generous if you set your phone down at the gym.
It also supports multi-point connection. You can take a call on your phone while music pauses on your laptop with a single button press — a small thing that matters a lot if you work and train in the same day. Calls run through a built-in mic with clear voice pickup.
The limitation is weather, not water. IPX6 handles sweat, rain and heavy spray, and MZYDM states plainly that it is not suitable for swimming. Submerging it will kill it. Buy it if your training is dry — running, cycling, gym, hiking — and you want maximum uptime with minimum weight. Skip it if you swim, or if you want active noise cancellation, because this model has none.
Side-by-Side: Which Should You Choose?
• Best for swimming → POLVCDG Swimming Headphones. IPX8 and 2m/1hr submersion is the only one of the two rated for it.
• Best for phone-free listening → POLVCDG Swimming Headphones. 32GB of storage versus no onboard memory.
• Best for lightest fit → MZYDM Bone Conduction Headphones. 29g versus 32g, and both use flexible frames.
• Best for calls in noisy places → POLVCDG Swimming Headphones. It has environmental noise cancellation; MZYDM has no noise control listed.
• Best for multi-device users → MZYDM Bone Conduction Headphones. Multi-point connection lets it hold a phone and a laptop at once.
• Best for wet-weather running and gym work → MZYDM Bone Conduction Headphones. IPX6 covers sweat and rain without the bulk of full waterproofing.
• Best for outdoor safety → either. Both are open-ear designs with unobstructed ear canals, though POLVCDG explicitly frames its 360° awareness pitch around running and cycling.
In my opinion, the deciding question is whether water is part of your training. If it is, buy the POLVCDG Swimming Headphones — the IPX8 rating and 32GB of storage solve a problem the MZYDM simply can't, and no amount of extra battery life makes up for a headphone that dies in the pool.
If you never swim, I'd take the MZYDM. Fifteen hours, 29g, multi-point connection and a lower weight make it the better daily driver for running and gym work, and it's the more sensible pick for most people. Both use Bluetooth 5.4 and both are open-ear, so the real split is waterproofing versus stamina. Worth checking the current price on Amazon before you commit, since that gap often settles the argument.
how to bone conduction earphones work
They vibrate a transducer against your cheekbone or temple instead of firing sound into your ear canal. Your skull carries those vibrations to the inner ear, so your eardrums stay uncovered and you keep hearing the world around you. That's why both of these are open-ear designs with 360° awareness.
how to wear bone conduction earphones
Hook the band behind your head, rest the transducers on the bone just in front of your ears, and adjust until the vibration feels firm but not pressed. Both models use flexible frames — POLVCDG's titanium frame and MZYDM's bendable hook — so you can shape them to your head. For swimming, the fit needs to stay put through turns, so test it on dry land first.
how to use bone conduction earphones
Pair over Bluetooth 5.4 for normal listening, then use the onboard controls for volume and track changes. The POLVCDG also has an MP3 mode: load music into its 32GB of storage and switch to that mode for swimming, because Bluetooth can't transmit underwater. The MZYDM is Bluetooth-only, so keep your phone or watch nearby.
how are bone conduction earphones different from regular earbuds
They don't seal or enter your ear canal, so nothing blocks ambient sound — better for traffic awareness, worse for blocking noise. Neither of these two has meaningful passive isolation, and only POLVCDG lists active noise cancellation for calls. They also tend to be lighter and more stable for movement than in-ear buds.
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See also: PocBuds Headphones vs Pmjebe Bone Conduction Swimming, AIAUXAI Earbuds 3.5mm vs POLVCDG Bone Conduction Headphones, RELAXYO Bone Conduction Swimming vs OceanSounds Open Ear Headphones