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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-18 · 7 min read · Independent comparison
• Rumatas Swimming Bone Conduction — biggest strength: a genuine swimming-first design with a 7-hour battery, 2-hour charge time, and Bluetooth 5.3 in a lightweight open-ear hook built for water.
• Rumatas Swimming Bone Conduction — biggest trade-off: no built-in MP3 storage and no IP waterproof rating is listed in its spec sheet, so underwater Bluetooth playback is a real-world question mark.
• FJX Bone Conduction Headphones — biggest strength: an IP68 waterproof rating plus 32 GB of built-in memory for MP3 playback, so you can swim with music without carrying a phone.
• FJX Bone Conduction Headphones — biggest trade-off: a shorter 4-hour average battery life and no Bluetooth underwater, so you have to switch modes constantly.
• Pick Rumatas Swimming Bone Conduction if you want longer listening time per charge and a simple wireless setup for walking, workouts and outdoor use.
• Pick FJX Bone Conduction Headphones if you actually swim laps and want music in the water with no phone nearby.
The Rumatas Swimming Bone Conduction headset (model X7) is a wireless, open-ear bone conduction unit with an ear-hook or wing shape and a Raven colorway, shipped with a black carrying case. It uses Bluetooth 5.3 with a stated range of about 33 feet, and it charges in 2 hours to deliver around 7 hours of playback. The design is listed as "Sporty," aimed at adults, and it uses a bone conduction driver rather than in-ear speakers.
What that tells me: this is the headset for someone who wants a no-fuss wireless bone-conduction pair for outdoor walks, gym sessions, and general workouts — the open-ear hook shape keeps your ear canal clear, so you stay aware of traffic, other people, and your surroundings while you train. The 7-hour figure is the standout number here. For a commuter or a long-walker, that's a full day of intermittent listening on one charge, and the 33-foot Bluetooth range means you can set your phone down on a bench and move around without the audio cutting out.
Who should buy it: walkers, joggers, gym-goers and outdoor athletes who want a long-lasting wireless bone-conduction pair and don't need to dive underwater with it. Who should skip it: anyone who wants to swim laps with music, and anyone who wants a headset that keeps playing when the phone stays in the locker.
FJX Bone Conduction Headphones: Who It's For
The FJX Bone Conduction Headphones (model AS9) are built around one clear idea: swimming with music, no phone involved. The headline spec is IP68 waterproofing — the highest common water-and-dust rating — paired with 32 GB of built-in storage that turns the headset into a standalone MP3 player. You load tracks via the included charging cable's USB connection, drag and drop your music onto the headset, and then swim with the local player. The manufacturer is explicit about the catch: Bluetooth doesn't transmit underwater, so you're supposed to switch to MP3 mode before you get in the pool. That's a genuinely honest piece of guidance, and it's the single most useful thing to know before buying.
The rest of the design supports that mission. It's a lightweight build using titanium in the frame, with an over-ear bone conduction shape and a grey finish. The frequency range is listed as 20 Hz – 20,000 Hz, which is standard full-range coverage for a bone conduction driver. Controls are touch-based media controls, and a double-tap switches between Bluetooth and MP3 modes while a triple-tap summons a voice assistant. In the box you get the headset, a charging cable, two special earbuds, a headphones bag, an elastic band, and a manual. There's also a 2-year manufacturer warranty and a stated 720-day after-sales service window.
Now the trade-offs. Battery life is listed at 4 hours on a 1.5-hour charge — roughly half the Rumatas figure, which matters if you're doing long open-water sessions. There's no noise control at all, which is expected for bone conduction but worth knowing. And the dual-mode workflow is genuinely fiddly: you can't just walk out the door and swim; you have to manage your music library on the headset and remember to switch modes. For casual users, that friction is real.
Who should buy it: swimmers, snorkelers, and multi-sport athletes who want music in the water without a phone, and anyone who values the peace of mind of an explicit IP68 rating and a 2-year warranty. Who should skip it: people who mostly want all-day wireless listening and don't swim — the Rumatas' longer battery and simpler Bluetooth-only setup fit that use case better.
• Best for battery life → Rumatas Swimming Bone Conduction (7 hours vs. FJX's 4 hours).
• Best for swimming with music → FJX Bone Conduction Headphones (IP68 plus 32 GB MP3 storage; you can leave the phone behind).
• Best for simple, always-wireless use → Rumatas Swimming Bone Conduction (Bluetooth 5.3, no mode-switching, no library to manage).
• Best for durability confidence in water → FJX Bone Conduction Headphones (explicit IP68 rating and a 2-year manufacturer warranty).
• Fastest recharge → FJX Bone Conduction Headphones (1.5-hour charge vs. Rumatas' 2 hours).
• Best for long outdoor walks and gym sessions → Rumatas Swimming Bone Conduction (open-ear hook shape, 33-foot range, all-day charge).
• Best for multi-sport swimmers who also run and cycle → FJX Bone Conduction Headphones (IP68 handles rain, sweat and pool water; MP3 mode works anywhere).
• Best for minimal fuss and setup → Rumatas Swimming Bone Conduction (pair once and go; no drag-and-drop music management).
One thing neither sheet answers is price. These two sit in different parts of the market depending on what you value — check the current price on Amazon before deciding, since the spec comparison above is the part I can speak to honestly.
In my opinion, I'd buy the FJX Bone Conduction Headphones if swimming is the whole point of the purchase. The IP68 rating and 32 GB of built-in memory are the two features that actually solve a swimmer's problem, and the 2-year warranty backs that up. The shorter battery and the mode-switching friction are real annoyances, but they're the price of swimming with music and no phone.
If you don't swim laps, though, I'd go the other way and pick the Rumatas Swimming Bone Conduction — its 7-hour battery and straightforward Bluetooth 5.3 wireless setup are simply better for walking, workouts and everyday outdoor listening. Match the headset to your actual routine, not the name on the box.
Its spec sheet lists no IP waterproof rating, so I wouldn't rely on it for regular submersion. The FJX, by contrast, carries an explicit IP68 rating and is the one designed for swimming with MP3 playback.
No. The manufacturer states that water interferes with Bluetooth transmission and advises using MP3 mode while swimming. Switch to the local player before you get in the water, and use the included earbuds for better sound.
Rumatas lists about 7 hours of average battery life on a 2-hour charge, while FJX lists about 4 hours on a 1.5-hour charge. Rumatas lasts longer per charge; FJX tops up faster.
Not in the water. The 32 GB built-in storage lets you load songs onto the headset and play them without any device. You'll need a phone or computer for Bluetooth mode and to transfer your music files in the first place.
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