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If you want a single pair of open-ear headphones that doubles as a 16GB MP3 player and survives pool sessions, choose Sudroid Bone Conduction Headphones; if you need the newer Bluetooth, bigger built-in storage and slightly longer playtime for serious lap swimming, choose RELAXYO Bone Conduction Swimming. Both are bone conduction, both are built for water. The split comes down to how you train and how you listen.
• Sudroid Bone Conduction Headphones — biggest strength: IP68 waterproofing plus a titanium wraparound band and 16GB of onboard storage, so it works in the pool and on land with or without your phone.
• Sudroid Bone Conduction Headphones — biggest trade-off: Bluetooth 5.0 is a generation behind, and the 6–8 hour rating is a range rather than a fixed number.
• RELAXYO Bone Conduction Swimming — biggest strength: IPX8 waterproofing, Bluetooth 5.4, 32GB of memory and a stated 7 hours of playtime in a 30g frame.
• RELAXYO Bone Conduction Swimming — biggest trade-off: no wired jack at all, and the manufacturer itself warns Bluetooth cannot transmit underwater, so MP3 mode is mandatory in the water.
• Who each pick is for: Sudroid suits swimmers and runners who want one rugged headset with plenty of stored music; RELAXYO suits lap swimmers who prioritize the latest Bluetooth and maximum onboard storage.
Sudroid's pitch is durability without fuss. The wraparound headband is titanium alloy with an adjustable silicone band, and the whole thing weighs 42g. That is a hair heavier than the RELAXYO, but titanium and silicone are a sensible combination for something that gets thrown in a swim bag and rained on. The open-ear, hook-style fit keeps your ear canal clear, which is the entire point of bone conduction: sound travels through bone to the inner ear instead of firing into your eardrum. You stay aware of traffic, other swimmers and whatever is happening around you.
Where it earns its keep is offline listening. There is 16GB of built-in memory — the spec sheet says that stores 4000+ tracks — and you can switch between MP3 mode and Bluetooth as needed. That matters, because Bluetooth does not travel through water. If you want music while your head is submerged, you are running off internal storage, and 16GB is a lot of laps. Battery is rated 6–8 hours of talk or music time with a 2-hour charge, and the 350 mAh cell plus Bluetooth 5.0 with a 10m range covers normal gym and running use. Sound is listed as high-fidelity stereo across a 20Hz–20kHz range, and there is a mic rated at -42dB for calls. Formats are broad: WMA, MP3, WAV, APE and FLAC.
Who should buy it: swimmers who want a big offline library, runners, gym-goers, skiers and anyone who wants one headset for bad weather and sweat. It ships with a USB cable and carries a 1-year warranty. Who should skip it: anyone who insists on the newest Bluetooth version, or who wants the lightest possible fit — at 42g it is the heavier of the two.
RELAXYO is the more swimming-specific design. The IPX8 rating is the headline, and the manufacturer notes you can wear it with goggles and a swim cap — a small detail that matters if you actually train in a pool rather than just splash around. It is also the lighter option at 30g, with an over-ear hook shape and an ergonomic build meant to be worn all day without pressure. Same core principle as the Sudroid: open-ear bone conduction, ear canals left open, situational awareness intact, less strain on the ears than in-ears.
Storage and connectivity are where it pulls ahead. There is 32GB of built-in memory — double the Sudroid — loaded via the included magnetic charging cable, which the manufacturer describes as letting your computer read the headphones as a USB drive. Bluetooth is 5.4, the newer standard, with the usual claims of better speed, range, stability and near-zero latency, plus lower power draw. Playtime is stated as up to 7 hours of music or calls on a full charge. Audio is bone conduction across 20Hz–20,000Hz.
The honest caveat is right in the spec sheet: Bluetooth cannot transmit underwater, so MP3 mode is the only option below the surface. That is physics, not a flaw, but it means you must load music before you swim. There is also no headphone jack and no active noise control — the control method is remote rather than touch. It comes with a one-year guarantee and a stated 24-hour customer service response window.
Who should buy it: lap swimmers who want the largest offline library, the newest Bluetooth for land use, and the lightest fit. Who should skip it: anyone who wants a wired option, or who prefers on-device touch controls.
• Best for battery life → RELAXYO Bone Conduction Swimming. A stated 7 hours beats Sudroid's 6–8 hour range, where the low end is 6.
• Best for storage → RELAXYO Bone Conduction Swimming. 32GB versus 16GB, which is the difference between a large library and a very large one.
• Best for newest Bluetooth → RELAXYO Bone Conduction Swimming. Bluetooth 5.4 versus 5.0.
• Best for lighter wear → RELAXYO Bone Conduction Swimming. 30g versus 42g.
• Best for rugged land use → Sudroid Bone Conduction Headphones. IP68 plus a titanium wraparound band and silicone build aimed at bad weather, skiing and workouts.
• Best for touch controls → Sudroid Bone Conduction Headphones. It uses touch control with volume control on the device; RELAXYO relies on a remote.
• Best for a wired fallback → Sudroid Bone Conduction Headphones. It has a USB connection; RELAXYO has no jack at all.
• Best for pool training with goggles and cap → RELAXYO Bone Conduction Swimming. That specific use case is called out in its own specs.
If I were buying for myself and my priority were swimming, I would buy the RELAXYO Bone Conduction Swimming. The 32GB of storage, Bluetooth 5.4, 7-hour rating and 30g weight line up with what a lap swimmer actually needs, and IPX8 is the rating the manufacturer ties directly to underwater use. I would pick the Sudroid Bone Conduction Headphones if I wanted one headset that leans more toward running, gym and outdoor weather, or if I valued touch controls and a USB connection. Neither is a bad choice — check the current price on Amazon before you commit, and let your main activity decide.
are headphones waterproof
It depends entirely on the rating, not the marketing. Both of these carry a genuine waterproof rating — Sudroid lists IP68 and RELAXYO lists IPX8 — which is why both are marketed for swimming. Ordinary headphones without a rating should be kept away from water entirely.
are headphones water resistant
Water resistant and waterproof are not the same thing. A water-resistant rating covers sweat and rain, while an IPX8 or IP68 rating is what allows submersion and swimming. Both products here go beyond simple resistance, which is why the manufacturers describe them as suitable for pool use.
No — and RELAXYO says so directly in its own specs, noting that Bluetooth cannot transmit underwater and that you must use MP3 mode. Sudroid takes the same approach with its switchable MP3 and Bluetooth modes. Load your music onto the built-in memory before you get in the water.
Sudroid has 16GB of built-in memory, which its spec sheet describes as storing 4000+ songs. RELAXYO has 32GB, double that. Both let you copy files from a computer over the included cable, so you can fill them up before a swim.
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