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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 lighter, all-day open-ear headphone with a big built-in music library for running, choose Yistao Bone Conduction Headphones; if you need maximum battery life and a headset built to go underwater for swimming, choose Aiwa.
• Yistao's biggest strength: a huge 32GB of built-in MP3 storage plus a very light 0.99 oz (26 g) titanium-frame build that's designed to sit comfortably for hours, even with sunglasses on.
• Yistao's biggest trade-off: 8 hours of playtime and no active noise cancellation — it's an awareness-first, open-ear design, not a noise-blocking one.
• Aiwa's biggest strength: up to 12 hours of playtime and an IP68 rating explicitly pitched at swimming, with 8GB of onboard storage so you can leave your phone in the locker.
• Aiwa's biggest trade-off: less onboard storage than the Yistao (8GB vs 32GB) and a heavier, more swim-focused design in bright yellow.
• Pick Yistao if you want the lightest all-day wear and the largest offline music library for running, gym and commuting.
• Pick Aiwa if you swim, train long, and want the longest battery life with a headset that can be fully submerged.
The Yistao X6 is built around the idea that you should forget you're wearing it. At 0.99 oz (26 g) with an adaptable titanium frame and hypoallergenic silicone, it's designed for long sessions — and the spec sheet specifically notes it's compatible with sunglasses, which matters if you run or cycle outdoors in daylight. The open-ear hook design keeps your ear canal clear so traffic, footsteps and voices still come through.
Audio comes from a 16mm bone conduction driver with a 20 Hz–20,000 Hz frequency range, paired with what Yistao calls SoundBeam technology for privacy and a high-frequency amplifier to cut background noise. That's a useful combination for a bone conduction set: the vibration is strong enough to carry detail, and the leakage is contained so people standing next to you aren't hearing your podcast. Bluetooth 5.3 is on board with AAC and SBC support, and the listing quotes a 300-meter range figure with 48Mbit/s transmission — realistically, you'll get a rock-solid connection at normal room-to-room distances rather than testing that number.
The headline feature, though, is the 32GB of built-in MP3 storage. That's a genuinely large offline library — enough for thousands of tracks — so you can run, lift or hike with no phone at all. Add IP68 sealing with a hydrophobic nano-coating against sweat and rain, an 8-hour battery that recharges in 2 hours, and an 18-month warranty, and you get a very complete everyday fitness headphone.
Buy it if you want the lightest possible all-day wear, the biggest offline music library, and you split your time between the gym, the road and the office. Skip it if you swim — the listing frames it for running and fitness, not submersion — or if you need noise cancellation, because this model has none.
The Aiwa Prodigy Swim (model AI5006, made by Sakar International) is a different animal. Where the Yistao optimizes for lightness, Aiwa optimizes for endurance and water. The 12-hour battery life is the standout number — 50% more runtime than the Yistao — which matters if you're doing long training blocks, multi-hour rides or back-to-back sessions without a chance to recharge.
Its IP68 rating is the other pillar, and Aiwa leans into it hard: the Prodigy Swim is described as fully submersible and resistant to sweat, dust and rain, and it's explicitly positioned for swimming, running, cycling and outdoor work. That's the key differentiator. Bone conduction is one of the few audio formats that works properly in water, because the driver vibrates your skull instead of firing sound into a water-filled ear canal — so a swim-focused bone conduction headset is a genuinely sensible product rather than a marketing gimmick.
The 8GB of onboard MP3 storage (roughly 2,000 songs per Aiwa's description) is smaller than the Yistao's 32GB but serves the same purpose: swim or train without Bluetooth. That's essential in a pool, where Bluetooth simply doesn't transmit through water.
Sound is handled by bone conduction drivers with a 20 Hz–20,000 Hz range, and — worth flagging — the spec sheet lists active noise cancellation with touch controls. On an open-ear design that's an unusual combination, and in practice open-ear ANC can only do so much, since the whole point is that your ears stay open to the world. Treat it as a bonus rather than a primary reason to buy. The build is plastic, rubber and silicone in bright yellow, aimed at adults and teens.
Side-by-Side: Which Should You Choose?
• Best for battery life → Aiwa. Up to 12 hours versus 8 hours on the Yistao.
• Best for swimming → Aiwa. IP68 with explicit submersion claims, versus an IP68 rating on the Yistao framed around sweat and rain.
• Best for offline music capacity → Yistao. 32GB of built-in MP3 storage against Aiwa's 8GB.
• Best for all-day comfort → Yistao. 0.99 oz (26 g) with a titanium frame and silicone that's designed for sunglasses compatibility.
• Best for privacy in shared spaces → Yistao. SoundBeam technology is specifically aimed at reducing sound leakage.
• Best for wireless flexibility → Yistao. Bluetooth 5.3 with AAC/SBC support is the newer, more capable Bluetooth generation here.
• Best for noise blocking → Aiwa. It's the only one of the two that lists active noise cancellation, though on an open-ear design expect modest results.
• Best for value if you train hard and long → Aiwa, because the extra runtime and swim capability are the two things you can't work around.
If I had to pick one, I'd buy the Aiwa Prodigy Swim. In my opinion, the 12-hour battery and the swimming-grade IP68 build cover the two scenarios where the Yistao would leave you stuck — long training days and water. The Yistao wins on weight, storage and Bluetooth generation, and if you never swim and want a huge offline library, it's the better fit. But for most people buying a bone conduction headset for sport, "it lasts longer and it survives the pool" beats "it's slightly lighter."
Based on the specs, yes. Aiwa markets the Prodigy Swim for swimming and full submersion under IP68. The Yistao is also IP68 rated, but its description centers on running, fitness and weather resistance rather than pool use.
The Yistao, by a wide margin, with 32GB of onboard MP3 storage versus Aiwa's 8GB (roughly 2,000 songs). If you want to leave your phone behind for long stretches, the Yistao holds far more.
Only the Aiwa lists active noise cancellation. The Yistao has none. Keep in mind both are open-ear designs, so neither isolates you the way sealed over-ear headphones would.
I can't quote a price here — check the current price on Amazon for both. On specs alone, Aiwa is the better value if you swim or need long runtime; the Yistao is the better value if you want maximum storage and the lightest fit for everyday running.
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