Sumao Bone Conduction Waterproof Earphones — 32GB MP3 Player, IP69 / IP68 Waterproof, Bluetooth 5.4

Designed for swimmers and athletes, these Sumao bone-conduction earphones combine an onboard 32 GB MP3 player with Bluetooth capability for flexible listening. The unit carries an IP68 waterproof rating and is built to tolerate full immersion to 2m, allowing use with a swim cap, goggles and earplugs. (Note: Bluetooth cannot transmit in water—switch to MP3 mode for playback while swimming.) Onboard storage lets you keep roughly 8000 songs directly on the device so you can toggle between MP3 mode and Bluetooth mode as needed. When out of the water, the latest Bluetooth 5.4 chip and built-in microphone enable wireless streaming and phone calls like conventional headphones. Weighing just 0.95 ounce, the open-ear, bone conduction design transmits sound through the cheekbones so you remain aware of your surroundings while listening. The bud-free fit is lightweight and secure for all-day comfort. Battery and build: a quick 2 hours of fast charging delivers about 8 hours of continuous playback. The headset is 360° flexible without deformation and includes an adjustable strap to keep it stable during intense activity. Use cases: ideal for swimming (use MP3 mode in water), running, cycling, training, walking, and general workouts. Includes all standard sport-friendly features such as a stable fit, sweat/water resistance, and hands-free calling.