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If you want an open-ear headphone built for running, cycling and long outdoor sessions with your phone, choose MZYQCY Bone Conduction Headphones; if you need audio that survives actual swimming and works without a phone in the water, choose KESIEME Swimming Headphones. That's the whole decision. One is a Bluetooth-first sports headset. The other is a dual-mode swim-and-sport headset with built-in memory. Everything below explains why that line is where it is.
• MZYQCY's biggest strength: a 15-hour playback figure paired with Bluetooth 5.4, multipoint switching and a 29g titanium open-ear frame — it's designed to stay on your head through long land workouts and back-to-back calls.
• MZYQCY's biggest trade-off: IPX6. That rating covers sweat, heavy rain and splashes, but it is not a swimming rating, and there's no on-board memory, so you need a paired device for every minute of audio.
• KESIEME's biggest strength: IPX8 waterproofing plus 32GB of built-in memory, which lets you listen up to 2 metres underwater in MP3 mode with no phone anywhere near you.
• KESIEME's biggest trade-off: battery life and range. It's quoted around 6–8 hours per charge (10+ hours at 60% volume on the 200mAh cell), and Bluetooth doesn't travel through water at all, so the wireless side is a poolside convenience rather than an underwater one.
• Choose MZYQCY if you're a runner, cyclist or commuter who wants maximum battery, the newest Bluetooth, and awareness of traffic.
• Choose KESIEME if you swim laps and still want one headset for running on dry land.
MZYQCY positions this as an endurance-first outdoor headset, and the spec sheet backs that framing. The headline numbers are 15 hours of playback and about 1.5 hours to a full charge, which means a week of hour-long runs between charges, or a single marathon-length session with plenty left over. There's a fast-charging claim attached too, which matters more than the big number when you've forgotten to plug in the night before.
The second thing you notice is the weight and frame. At 29g with a titanium frame, it's built to sit still during sprint intervals and yoga rather than slide around. Bone conduction means your ear canals stay open, so you hear traffic, other runners and emergency signals while the audio plays through your cheekbones — the entire reason this category exists. Bluetooth 5.4 with multipoint is here as well, so you can jump between a phone and a tablet without re-pairing, and the quoted range is generous enough that you can leave the phone on a bench and keep moving.
For controls and calls, MZYQCY uses physical buttons rather than touch, which I personally prefer when my hands are sweaty, and there's environmental noise cancellation on the mic side for windy outdoor calls. The IPX6 rating is the honest limit: profuse sweat, a heavy rain shower and a splash are all fine, but this is not a headset you submerge. There's also no built-in storage, so it's Bluetooth or nothing.
KESIEME Swimming Headphones: Who It's For
KESIEME solves a different problem. The IPX8 rating is the core of the product: deeply waterproof against sweat, moisture and dust, and rated for listening to downloaded songs up to 2 metres underwater. The critical detail is the mode switch. Bluetooth cannot transmit through water, so underwater listening runs in MP3 mode from the built-in 32GB of memory — you load your tracks beforehand and the headset plays them with no phone involved. That's the feature that makes this a swim product rather than a splash-resistant one.
Battery is where it gives ground. KESIEME quotes 6–8 hours of continuous music and calls on a full charge, or 10+ hours at 60% volume from the 200mAh battery, with roughly 2 hours to recharge over USB-C. For a swim-plus-gym routine that's a couple of sessions per charge, not a week. The Bluetooth range figure in the spec sheet is listed in inches, which tells you the wireless side is meant for close-range use — realistically, the headset near your phone on the pool deck or in a gym bag.
In the box you get a storage bag and swimming earplugs, which is a small but telling inclusion: earplugs stop water sloshing into your ears so the bone conduction vibrations come through cleanly. The 15mm bone conduction driver and 16-ohm impedance are tuned for that job. The frame is a wraparound titanium design, open-ear, with physical buttons and active noise cancellation on the mic side, and it's listed at 37g — still light, though noticeably more hardware than the MZYQCY.
Buy it if you swim, want one headset that also handles running and cycling, and like the idea of leaving your phone in the locker. Skip it if battery life is your number one priority, you want the longest Bluetooth range, or you rarely go near water and would be paying for waterproofing you'll never stress.
• Best for battery life → MZYQCY Bone Conduction Headphones. 15 hours versus roughly 6–8 hours on a charge is not a close call.
• Best for swimming → KESIEME Swimming Headphones. IPX8 and 2-metre underwater playback in MP3 mode; the MZYQCY's IPX6 simply isn't rated for it.
• Best for phone-free listening → KESIEME Swimming Headphones. 32GB of built-in memory means no paired device required.
• Best for Bluetooth connectivity → MZYQCY Bone Conduction Headphones. Bluetooth 5.4 with multipoint and an extended range up to about 50 feet / 15 metres beats a short-range wireless link.
• Best for running and cycling → MZYQCY Bone Conduction Headphones. At 29g with a titanium frame and open-ear awareness, it's purpose-built for land training.
• Best for a single do-everything headset → KESIEME Swimming Headphones. It covers pool laps, gym sessions and outdoor runs, as long as you accept shorter runtime.
• Best for calls and commute use → MZYQCY Bone Conduction Headphones. Noise-reduced mics, multipoint switching and enough battery for back-to-back meetings.
• Best if you hate charging → MZYQCY Bone Conduction Headphones. Fewer charge cycles per week, and a quicker top-up when you do need one.
In my opinion, the MZYQCY is the better buy for the majority of people, because most buyers searching this category are runners and riders who'll never actually submerge their headset — and for them, 15 hours of playback, Bluetooth 5.4 with multipoint and a 29g frame are the specs that matter every single day. I'd only point you to the KESIEME if swimming is a genuine part of your routine. If it is, the IPX8 rating and 32GB of built-in memory aren't nice-to-haves; they're the whole reason to buy it, and no amount of extra battery on the MZYQCY replaces them. Pick based on whether you get in the water.
Not overall — they win on different things. The KESIEME is the only one of the two rated IPX8 with 32GB of built-in memory for underwater MP3 playback. The MZYQCY offers roughly double the battery life, multipoint Bluetooth 5.4 and a lighter 29g frame. Water decides it.
No. MZYQCY is rated IPX6, which covers sweat, heavy rain and splashes but is not a swimming rating, and it has no built-in storage — it needs a paired Bluetooth device for all audio. For lap swimming, the KESIEME's IPX8 rating and MP3 mode are what you want.
No, and you can't use one there anyway — Bluetooth doesn't transmit through water. You load songs into the 32GB of built-in memory and play them in MP3 mode, which works up to 2 metres underwater. Keep Bluetooth for dry-land use.
The MZYQCY, clearly. It's rated for 15 hours of continuous playback with a 1.5-hour charge time. The KESIEME is quoted at 6–8 hours of music and calls, or 10+ hours at 60% volume from its 200mAh battery, with about 2 hours to recharge.
I don't quote prices here because they change often. Check the current price on Amazon using the button on this page before you decide, and weigh it against which spec set — long battery or true waterproofing — you actually need.
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