Best Overall
PSIER S18
Key details
- Ear Design
- Open-ear bone conduction
- MP3 Storage
- 32GB
- MP3 Battery Life
- 8 hours
- Waterproof Rating
- IPX8
The PSIER S18 combines 32GB of onboard MP3 storage with an IPX8-rated shell, giving swimmers a phone-free audio library that survives submersion. The 14mm bone-conduction driver keeps the ear canal open and delivers clear sound underwater, then the same unit pairs with a phone for land-based workouts and calls. The bone-conduction design leaves both ears exposed, which is a practical safety feature in crowded lanes.
Underwater playback is the central act here: the frame stays put through flip turns, the controls are reachable by feel, and the open-ear fit keeps you aware of lane traffic. In a 50-meter pool, the MP3 mode holds a consistent output and doesn't shift mid-length. Battery life covers a typical swim-and-gym day, and the charge cycle is short enough to top up between sessions.
Lap swimmers who want a phone-free MP3 companion and a Bluetooth option for dry-land training get both from one budget-friendly unit. Buyers who require a guaranteed 8-hour runtime or flawless above-water Bluetooth should look at premium models; the MP3 swim mode is the headphone's core strength. The open-ear format suits swimmers who want ambient awareness, not a sealed ear canal, and the 32GB capacity is enough for a rotating playlist of thousands of tracks.
The feature set is squarely aimed at swim-first buyers: the 32GB library eliminates the need for an armband or phone case, while the IPX8 shell removes worry about pool chemicals and submersion. Extras like app EQ and premium service are absent, which keeps the price low and the focus on the two features that matter most. For multi-sport athletes, the Bluetooth side handles treadmill runs and gym sessions without needing a second pair of headphones.
Sound leans toward clarity over heavy bass, which suits underwater bone conduction better than a bass-boosted curve. The frame holds position through flip turns, and the controls are easy to find without looking. In open water, the lack of ear occlusion keeps wind noise and boat horns audible, a safety benefit that in-ear models can't match.
Physical buttons make the controls usable with wet hands, a practical detail for poolside adjustments. There is no companion app to wrestle with, and the S18 operates as a standalone music player once your library is loaded. Transferring tracks takes a few minutes through the charging cable, and then the headphone behaves like an iPod for swimmers.
💡 Top it up between sessions and the runtime will cover a full day of training.
Pros
- 32GB onboard storage carries thousands of songs for phone-free pool sessions.
- Open-ear sound stays clear while keeping both ears available for lane and trail awareness.
- Secure, comfortable fit holds through flip turns across varied ear sizes.
- Battery handles typical workout days and recharges quickly between sessions.
- Handles both call audio and underwater MP3 playback without skipping.
Cons
- Above-water Bluetooth can drop when the phone is on the opposite side of the body or behind a wall.
- Battery runtime can vary from the 8-hour claim, so longer training days may need a mid-day charge.
The S18 is the swim-first value pick for anyone who wants 32GB of MP3s under the water and a Bluetooth connection for the gym. It does both without a premium price.