How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-21 · 6 min read · Independent comparison
• Kethmeva's biggest strength: IP68 waterproofing rated for full immersion to 2 meters, plus 32GB of built-in memory that holds roughly 8,000 songs — so you can swim with music and no phone at all.
• Kethmeva's biggest trade-off: Its Bluetooth signal can't travel through water, so underwater listening depends entirely on MP3 mode. Nothing smart, no camera, no app.
• Vivezin's biggest strength: A 38.4g bone-conduction headset with a 1080P camera, AI translation across 160+ languages, and a voice assistant — four gadgets collapsed into one.
• Vivezin's biggest trade-off: IP65 means sweat, rain and splashes only. It is not built for swimming or submersion.
• Buy Kethmeva if your priority is laps in a pool with your own playlist and zero phone nearby.
• Buy Vivezin if your priority is capturing footage, talking across languages, and staying hands-free on land.
The Kethmeva S18 is a single-purpose tool, and that's the point. It's a bone-conduction headset built around one scenario: being underwater. The IP68 rating covers full immersion down to 2 meters, and the design is meant to sit alongside a swim cap, goggles and earplugs without fighting them. Because the drivers sit outside your ear canal, your ears stay open — you hear the pool, traffic or a training partner while your music plays.
What makes it genuinely useful for swimmers is the 32GB of internal memory. That's roughly 8,000 songs loaded directly onto the headset, played in MP3 mode with no phone involved. That matters because Bluetooth simply doesn't transmit through water, and Kethmeva says so plainly in its own documentation — underwater, you use MP3 mode. On land, Bluetooth 5.4 takes over with a 10-meter range, so the same headset works for running, cycling, gym sessions and video calls. Battery life is rated at 8 hours of playback with a 2-hour charge via magnetic charging, and the controls are simple push buttons covering play/pause, track skipping, mode switching and calls.
Who should buy it: lap swimmers, open-water swimmers and triathletes who want their own music without a phone, plus anyone who wants one headset for both the pool and the run. The open-ear fit and silicone cushions are designed to stay comfortable over long sessions.
Who should skip it: anyone who wants a camera, translation, an app, or voice-assistant features. There's none of that here. Noise control is listed as none, and if your workouts are land-only and you'd rather have smart features than swim depth, the Kethmeva is overqualified in the wrong direction. Also note that if you want to swim with Bluetooth audio specifically, no bone-conduction headset can do that — plan on MP3 mode.
The Vivezin OWS-G206 is the opposite philosophy: instead of doing one thing perfectly, it tries to replace your action camera, your earbuds, your translation app and your smart assistant in a single 38.4g wraparound frame. The headline feature is the built-in 1080P camera shooting at 30fps with a wide-angle lens and electronic image stabilization, backed by an 8MP sensor for stills. Footage can be imported into the companion app for extra stabilization and photo noise reduction — turning raw clips into something clean enough to post.
Then there's the translation layer: AI-powered, two-way, real-time, covering 160+ languages, with dual ENC microphones picking up speech and delivering translated audio straight to your ears. For travel or meetings abroad, that's a genuinely different kind of product — a conversation tool you wear rather than hold. Add the "Hi Luma" voice assistant for weather, reminders, object identification and hands-free queries, and the pitch is clear: one wearable for capture, communication and convenience.
Audio comes from 16mm Hi-Fi drivers, and the dual ENC mics also work to keep your voice clear on calls in wind or crowds. The open-ear design keeps your ear canals free for traffic and announcements. The titanium alloy frame resists deformation, the silicone surface is skin-friendly, and the ergonomic wraparound shape is meant to stay bounce-free during hard workouts. It's rated IP65 — sweat, rain and splashes, not swimming.
Who should buy it: cyclists, vloggers, hikers, commuters and frequent travelers who want first-person footage and live translation without juggling devices. Who should skip it: swimmers, and anyone who wants the simplest possible headset. If your main workout is in a pool, IP65 won't cut it.
• Best for swimming → Kethmeva Swimming Headphones. IP68 with 2-meter immersion versus IP65 splash resistance. This one isn't close.
• Best for phone-free music → Kethmeva Swimming Headphones. 32GB on board, roughly 8,000 songs, MP3 mode with no connection needed.
• Best for battery clarity → Kethmeva Swimming Headphones. A stated 8 hours of playback and a 2-hour charge time; Vivezin doesn't publish a battery figure in its specs, so you can't compare them directly.
• Best for capturing video → Vivezin OWS-G206. 1080P at 30fps, 8MP stills, wide-angle lens, EIS, plus app-based enhancement.
• Best for travel and language barriers → Vivezin OWS-G206. Real-time two-way translation across 160+ languages with dual ENC mics.
• Best for hands-free convenience → Vivezin OWS-G206. The "Hi Luma" voice assistant handles queries, reminders and notes without touching your phone.
• Best for all-day light wear → Vivezin OWS-G206. 38.4g with a titanium alloy frame and wraparound fit designed to stay put during intense workouts.
• Best for call clarity in noisy places → Vivezin OWS-G206. Dual ENC microphones are explicitly built to filter background noise; Kethmeva lists no noise control at all.
• Best for pool + gym + run in one device → Kethmeva Swimming Headphones. It's the only one of the two that crosses from water to land.
In my opinion, the right pick here comes down to one question: is water the point? If you swim — laps, open water, triathlon training — I'd buy the Kethmeva Swimming Headphones. The IP68 rating, the 2-meter depth tolerance and the 32GB of internal storage solve the exact problem swimmers have, and they still work fine for running and cycling on land. If you don't swim, I'd buy the Vivezin OWS-G206. The camera, translation and voice assistant make it a genuinely more capable everyday wearable, and IP65 is plenty for sweat and rain. Two different tools for two different lives — pick the one that matches yours.
FAQ
I wouldn't. It's rated IP65, which covers sweat, rain and splashes — not submersion. It's built for cycling, running, hiking and travel, not the pool.
That depends on what you're counting. Kethmeva gives you swim-depth waterproofing plus 32GB of phone-free storage. Vivezin gives you a camera, 160+ language translation and a voice assistant. Since this page doesn't list prices, check the current price on Amazon and weigh it against which feature set you'll actually use.
Kethmeva lists noise control as none — it's an open-ear design meant to keep you aware of your surroundings. Vivezin doesn't list active noise cancellation either, but it does use dual ENC microphones to filter background noise on calls.
Vivezin states 38.4g for the headset. Kethmeva doesn't publish a weight figure in its specs, so I can't compare them fairly on that point — Vivezin is the only one with a confirmed number.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.