Diver Waterproof Bluetooth In-Ear Headphones with Microphone (Model: BTH-20) Waterproof and Sweatproof - IPX8 Sports Bluetooth Headphones, however Bluetooth signals generally do not work in water so the headphones are not recommended for swimming. Wireless Bluetooth Headphones for streaming audio from smartphones and other Bluetooth devices (Bluetooth Version 4.0) Great Sound Quality - Great quality headphones with Built-in Microphone with Strong signal for high quality sound even in noisy environments like inside a gym and running / cycling on the road Powerful Rechargeable Battery - Built-in polymer lithium battery (80mAh), up to 120 hours of stand-by, up to 6 hours of talk time, up to 1.5 hours charging time. Comfortable and Lightweight - Portable, comfortable and flexible design, comes with 3 different earbud sizes to ensure the perfect fit for your ears.