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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a swimming-focused bone conduction headset with a huge offline music library and a lightweight open-ear fit, choose AYI Professional Swim Headphones; if you need Bluetooth 5.4 with dual-device pairing and a higher waterproof depth rating for open water, choose KOPIDOE Bone Conduction Swimming.
• AYI Professional Swim Headphones — biggest strength: true bone conduction drivers, IP68 sealing and a claimed 8-hour battery, plus a 32GB MP3 mode so you never need your phone poolside.
• AYI Professional Swim Headphones — biggest trade-off: it runs Bluetooth 5.4 for general use, but underwater the signal can't travel, so you're locked into MP3 mode the moment you submerge — same as any bone conduction set.
• KOPIDOE Bone Conduction Swimming — biggest strength: Bluetooth 5.4 with dual-device pairing and up to 33 feet of range, plus an IPX8 rating stated for immersion up to 3 meters.
• KOPIDOE Bone Conduction Swimming — biggest trade-off: at 4.8 ounces it's the heavier of the two, and the silicone-and-plastic build is bulkier than AYI's 0.07-pound hook design.
• Who each pick is for: AYI suits lap swimmers and multi-sport users who want the lightest possible open-ear wear; KOPIDOE suits the swimmer who wants stronger Bluetooth flexibility and deeper submersion tolerance.
The AYI CS05 Black is built around one idea: keep the music playing while your head is underwater. The spec sheet lists an IP68 waterproof, dustproof and sweatproof rating with a patented full-seal sound chamber, which is the part that actually matters for swimming — a sealed chamber is what lets the driver survive repeated submersion instead of fogging up and dying. AYI also states the headphone is designed to stay under water for long periods, which is a more swimming-specific claim than most open-ear sets make.
Who should buy it: lap swimmers, triathletes, runners and cyclists who want one headset that covers the pool and the pavement, and anyone who hates the pressure of in-ear tips. Who should skip it: if your priority is long-range Bluetooth with two devices connected at once, or you regularly dive deeper than a few meters, the KOPIDOE's spec sheet answers those needs more directly. Also note the AYI has no headphone jack and no active noise control — it's wireless-only and open by design, so it won't block out a noisy gym.
KOPIDOE Bone Conduction Swimming: Who It's For
The KOPIDOE X7 takes the same bone conduction approach and leans harder into connectivity and water tolerance. Its headline claim is IPX8 waterproofing rated for immersion up to 3 meters for extended periods, which covers pool laps, surfing and getting caught in the rain. Like the AYI, it switches to MP3 mode for swimming — Bluetooth signals simply don't travel through water, and KOPIDOE says so plainly on the spec sheet. The 32GB of built-in storage holds up to roughly 9,000 songs, so offline listening is genuinely generous.
The Bluetooth side is the real differentiator. KOPIDOE uses Bluetooth 5.4 with a stated range of about 33 feet (10.06 meters) and supports connecting to two devices at once, so you can hop between a phone and a laptop without repairing. The battery is a 200mAh cell rated for 8 hours of music or talk time and 72 hours of standby, recharging in about 2 hours through a magnetic waterproof port — a nice touch, since open ports and pool water don't mix well.
The trade-offs are honest ones. It weighs 4.8 ounces, noticeably more than the AYI, and the enclosure is plastic with silicone rather than a slim hook shell. Controls are touch-based rather than remote, which some swimmers love and some find fiddly with wet hands. The frequency range matches AYI at 20 Hz – 20,000 Hz, and there's no noise control or wired option here either.
Side-by-Side: Which Should You Choose?
• Best for the lightest fit → AYI Professional Swim Headphones (0.07 lb hook design vs 4.8 oz).
• Best for deeper submersion tolerance → KOPIDOE Bone Conduction Swimming (IPX8 stated for immersion up to 3 meters).
• Best for Bluetooth flexibility → KOPIDOE Bone Conduction Swimming (Bluetooth 5.4, dual-device pairing, ~33 ft range).
• Best for offline music capacity → a near tie, but KOPIDOE quotes up to 9,000 songs from 32GB versus AYI's "thousands."
• Best for charging convenience → KOPIDOE Bone Conduction Swimming (magnetic waterproof port, ~2-hour charge).
• Best for control style → AYI Professional Swim Headphones if you prefer a remote-style control method over touch.
• Best for multi-sport all-rounders → AYI Professional Swim Headphones, since the lighter open-ear hook travels better between swim, bike and run.
• Best for pool-first swimmers who want a sealed chamber built for long submersion → AYI Professional Swim Headphones.
• Best value → depends on the current price on Amazon, which you should check for both before deciding, since the specs alone don't settle it.
If I were buying for myself, I'd take the AYI Professional Swim Headphones. The 0.07-pound weight and IP68 sealed-chamber design are exactly what I'd want for lap swimming, and the 32GB MP3 mode plus 8-hour battery covers everything else in my week. The KOPIDOE X7 is the better pick if you specifically want IPX8 depth tolerance and dual-device Bluetooth 5.4 — that's a real advantage, not a marketing line. But for the swimmer who wants one light, simple headset that disappears on your head, AYI is my recommendation.
how to bone conduction earphones work
Bone conduction drivers vibrate against your cheekbones and send sound to your inner ear, bypassing the ear canal entirely. Both the AYI and KOPIDOE use bone conduction drivers with a 20 Hz – 20,000 Hz range, which is why your ears stay open to traffic and poolside noise.
how to use bone conduction earphones
Pair them over Bluetooth for everyday use, then switch to MP3 mode before you get in the water — Bluetooth can't transmit underwater, and both brands state this. Load your tracks into the 32GB of built-in memory first, then use the controls to play, skip and pause.
how to wear bone conduction earphones
Rest the hook over your ear with the driver sitting against your cheekbone, just in front of the ear. Both models use an open-ear hook shape that stays put during movement, and the AYI's 0.07-pound build keeps pressure minimal on longer sessions.
how are bone conduction earphones different for swimming
The difference is the waterproofing and the offline mode. AYI uses IP68 with a full-seal sound chamber; KOPIDOE uses IPX8 rated for immersion up to 3 meters. Neither transmits Bluetooth underwater, so both rely on their 32GB MP3 storage while you swim.
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