How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-30 · 6 min read · Independent comparison
• MARLALL Bone Conduction Swimming — biggest strength: Purpose-built for swimming with an IPX8 waterproof rating, an ergonomic ear-hook fit that distributes pressure, and 32GB of built-in MP3 storage so you swim without a phone.
• MARLALL Bone Conduction Swimming — biggest trade-off: Bluetooth does not work underwater, so swimming is MP3-mode only, and the mic needs drying after a swim to avoid call issues.
• Monster Open Ear BC300 — biggest strength: Up to 10 hours of playtime, Bluetooth 6.0 for a stable low-latency connection, 32GB of built-in storage, and an IPX8 rating good for submersion up to 2 meters for up to 2 hours.
• Monster Open Ear BC300 — biggest trade-off: The product info lists Bluetooth version 5 while the feature copy says Bluetooth 6.0, and there's no active noise control — it's an awareness-first design, not an isolation one.
• Who each pick is for: MARLALL for the lap swimmer who wants a simple, secure, swim-dedicated set; Monster for the all-round athlete who wants one headphone for running, cycling, gym work and the occasional swim.
MARLALL's pitch is narrow and clear: this is a swimming headphone first. The IPX8 rating means it's built to handle immersion, so pool laps, snorkeling and surfing are all in scope. The ear-hook design spreads pressure evenly rather than clamping down on one spot, which matters when you're wearing something for a full session in the water. And because it's open-ear with no buds, your ear canals stay clear — you keep hearing what's around you while running or hiking.
The real story here is the built-in 32GB of storage. Swimming and Bluetooth don't mix, and MARLALL says so plainly: Bluetooth mode isn't supported underwater, so swimming runs on MP3 mode. That's not a flaw, it's the design. You load playlists onto the internal memory and the headphone plays them with no phone anywhere near the pool. The magnetic charging cable also lets you plug straight into a computer to manage those playlists, which is a genuinely convenient touch, and 1.5 hours of charging gets you up to 7 hours of playback.
Buy it if you swim regularly and want a set that's obviously made for the water — secure, lightweight, silicone-sealed, and self-contained. Skip it if your main use is Bluetooth calls and streaming on land; you'd be paying for swim capability you won't use, and the underwater Bluetooth limitation would just frustrate you. One practical note from the specs: dry the microphone after swimming to prevent call issues, and remember that music from a phone app can't be copied directly to the headphone's memory card.
The BC300 is the more versatile athlete's tool. It rests outside your ears rather than pressing in, so there's no pressure build-up and no ear fatigue on long sessions — and because your ear canals stay open, you stay aware of traffic and conversations on runs and rides. Sound travels through your cheekbones, which is the same bone conduction principle MARLALL uses, just aimed at a broader range of sports.
Where it pulls ahead on paper is stamina and connectivity. Monster claims up to 10 hours of playtime against MARLALL's 7, and it lists Bluetooth 6.0 for a stable, low-latency connection with clear calls on the go. The 32GB of built-in storage matches MARLALL, so wire-free listening without a phone is on the table here too, and the IPX8 rating covers heavy sweat, rain and temporary submersion — up to 2 meters for up to 2 hours, per the description. There's even a built-in microphone with the same IP68 water resistance, which is a meaningful difference if you want to take calls around the water rather than leave the headphone in your bag.
Two honest caveats. The spec sheet lists Bluetooth version 5 while the feature copy says 6.0, so treat the exact version with a little caution. And noise control is listed as "None" — this is an open-ear, awareness-first design, not something you buy to block out a noisy gym.
• Best for dedicated lap swimming → MARLALL Bone Conduction Swimming. The whole design assumes you're in the water, and the MP3-only underwater rule is stated up front.
• Best for battery life → Monster Open Ear BC300. Up to 10 hours versus MARLALL's up to 7.
• Best for calls and mic use → Monster Open Ear BC300. It has a built-in mic with matching IP68 water resistance; MARLALL's mic needs drying after a swim.
• Best for the shortest charge window → MARLALL Bone Conduction Swimming. A 1.5-hour charge to full playback is a quick turnaround between sessions.
• Best for mixed-sport athletes → Monster Open Ear BC300. Running, cycling, trail and gym use are all explicitly in its lane.
• Best for a simple, swim-only routine → MARLALL Bone Conduction Swimming. Load the 32GB, hit the pool, no phone, no fuss.
• Best for newer Bluetooth → Monster Open Ear BC300. It advertises Bluetooth 6.0 for low-latency streaming, though the spec list says 5.
• Best for all-ages sharing → Monster Open Ear BC300. Its age range is listed as All Ages; MARLALL's is listed as Adult.
In my opinion, the Monster Open Ear BC300 is the better buy for most people, because it covers more ground: longer battery life, a waterproof mic, newer Bluetooth, and the same 32GB of onboard storage — so it handles swims and everything around them. I'd only steer you to MARLALL if swimming is basically all you do and you want a set that's unambiguously built around that one job, with a fast 1.5-hour charge and an ear-hook fit tuned for the water. Either way, check the current price on Amazon before deciding, since value is the one thing specs can't tell you.
FAQ
how to bone conduction headphones work
how to wear bone conduction headphones
Rest the transducers against your cheekbones just in front of your ears, with the band or hooks sitting securely behind. MARLALL uses an ear-hook design that spreads pressure evenly; the BC300 rests outside the ear without pressing in, so neither should feel clamped.
how to use bone conduction headphones
For land use, pair over Bluetooth and stream as normal. For swimming, both rely on built-in storage — the MARLALL is MP3-mode only underwater and its Bluetooth doesn't work in the pool, and the BC300's 32GB lets you swim wire-free from a phone.
how to bone conduction headphones for swimming
Load music onto the internal memory first, since Bluetooth won't carry underwater. MARLALL's magnetic cable lets you manage playlists straight from a computer, and the BC300 stores thousands of songs in its 32GB — then just wear them and swim.
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