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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want true underwater listening while you swim, choose SAMVEK Swimming Headphones Underwater; if you need all-night audio comfort for sleep, rest, and travel, choose MUSICOZY 5.4. These two share the same Bluetooth 5.4 label, but they are built for completely different parts of your day — one is a pool tool, the other is a pillow companion. Below I break down what each design actually gives you, and which one fits your routine.
• SAMVEK's biggest strength: IP68 waterproofing plus 32GB of built-in MP3 storage, so it keeps playing music underwater with no phone nearby.
• SAMVEK's biggest trade-off: Bluetooth does not work underwater at all — you must switch to MP3 mode before you get in the water.
• MUSICOZY 5.4's biggest strength: A full-wrap sleep mask with 14 hours of playback and a washable, detachable speaker module.
• MUSICOZY 5.4's biggest trade-off: It is not waterproof — this is a dry-land sleep and relaxation product, not a swimming one.
• Choose SAMVEK if you train in a pool, snorkel, or run and want open-ear bone conduction audio.
• Choose MUSICOZY 5.4 if you want to fall asleep to music, block out light, and wear headphones on a plane or in bed.
The SAMVEK X7 is one of the few designs that treats water as the main event rather than an accident it can survive. The IP68 rating is the headline: it's rated for full immersion up to two meters deep for up to two hours, which lines up neatly with a typical swim session. It's also sweatproof and rainproof, so the same pair that goes in the pool can handle a rainy run the next morning.
The clever part is how it solves the underwater audio problem. Bluetooth 5.4 has a 10-meter range and handles calls and music on land, but the brand is upfront that Bluetooth doesn't transmit through water. That's exactly why there's 32GB of built-in memory — enough for thousands of songs in MP3, WMA, WAV, APE, and FLAC formats. You load your playlist, switch to MP3 mode, and the headphones never need your phone again. I think this is the single most important detail for a swimmer: no phone on the pool deck, no dropped connection mid-lap.
It's also a bone conduction design, which means sound travels through your cheekbones and leaves your ear canals open. At 30 grams with a retractable headband and an open-ear fit, it's built to sit lightly for long sessions, and the open design keeps you aware of your surroundings — useful when you're sharing a lane or running near traffic. Controls are simple push buttons, and the ABS/PC body in black is clearly meant to be knocked around. Charging takes about two hours.
Who should buy it: lap swimmers, snorkelers, surfers, and runners who want one pair for water and land, and who are happy to manage an offline MP3 library. Who should skip it: anyone who wants to stream Spotify, take calls, or control playback from a phone while in the water — that's simply not how this works. If you want wireless audio only on dry land and never swim, this is more product than you need.
MUSICOZY 5.4 is a different animal entirely, and it's honest about it. This is a Bluetooth sleep mask — a full-wrap fabric band with flat speakers built in, designed to sit over your eyes and ears while you lie down. The material is seaweed fiber cotton, chosen for breathability and a soft, dry feel against skin, which matters if you sleep warm or have sensitive skin. The color is light green, and it's sized as a single adjustable unit.
The design details are all pointed at sleep, not sport. The full-cover wrap is shaped to block light completely without pressing on your eyes or ears, which is the specific complaint side sleepers have about ordinary masks. The Velcro strap is built to adjust silently, so tightening it in the dark doesn't wake you or snag your hair. And the electronics are removable: the Bluetooth module and speakers pull out so the fabric can be washed, which is the difference between a mask you use nightly and one you quietly stop using.
On the tech side, it runs Bluetooth 5.4 for faster pairing and lower power draw, with a 200mAh battery good for up to 14 hours of playback after a two-hour Type-C charge. Fourteen hours covers a full night plus a nap. The pitch is immersive stereo sound for meditation, relaxation, travel, and sleep — and it's positioned as a gift for men, women, teens, and kids.
Who should buy it: side sleepers, light-sensitive sleepers, travelers on red-eye flights, meditators, and anyone who wants audio without earbuds pressing into their ears all night. Who should skip it: swimmers, runners, and gym users. There is no waterproofing here, and no bone conduction or open-ear awareness — it's a rest product, full stop.
• Best for swimming → SAMVEK Swimming Headphones Underwater. IP68, two-meter immersion for up to two hours, plus 32GB of offline music.
• Best for sleep and light blocking → MUSICOZY 5.4. A full-wrap mask that blocks light and plays for up to 14 hours.
• Best for battery life → MUSICOZY 5.4. 14 hours of playback versus a two-hour charge cycle on the SAMVEK with no stated runtime.
• Best for phone-free use → SAMVEK. The 32GB of built-in memory means no device required at all.
• Best for land-based workouts → SAMVEK. Open-ear bone conduction keeps you aware of traffic and surroundings while running or cycling.
• Best for sensitive skin and washing → MUSICOZY 5.4. Seaweed fiber cotton with a detachable, washable module.
• Best for travel → depends on the trip. A red-eye flight favors MUSICOZY; a swim holiday favors SAMVEK.
• Best for calls and device switching → SAMVEK on dry land. Bluetooth 5.4 with 10-meter range and multi-device connection, with the caveat that it's land-only.
If I had to pick one, I'd take the SAMVEK Swimming Headphones Underwater. In my opinion it does the harder job: it's the only one of the two that works in water, it doesn't need a phone, and the bone conduction design doubles as a running and cycling headphone. The MUSICOZY 5.4 is genuinely good at what it does, and I'd recommend it without hesitation to a side sleeper — but its job is narrower. Buy SAMVEK for movement and water; buy MUSICOZY for rest.
Yes — it carries an IP68 rating and is described as withstanding full immersion up to two meters deep for up to two hours. It's also sweatproof and rainproof. Just remember that Bluetooth doesn't work underwater, so you need to be in MP3 mode while submerged.
Can I use the MUSICOZY 5.4 in the pool or shower?
MUSICOZY 5.4 states up to 14 hours of playback from a 200mAh battery with a two-hour Type-C charge. SAMVEK lists a two-hour charge time but no playback figure, so on paper MUSICOZY is the one with a clearly stated long runtime.
Not in the water. It has 32GB of built-in storage for your own music files, so you can swim with no device nearby. On land, Bluetooth 5.4 lets you connect to multiple devices, take calls, and stream — with a 10-meter range.
Both are affordable accessories, but I can't quote figures here. Check the current price on Amazon for each and weigh that against which job you actually need done — water audio or sleep audio.
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