Diver Weatherproof Bluetooth Bone Conduction Headphones with Microphone (Model: EF-80) Wireless Bluetooth Headphones for streaming audio from smartphones and other Bluetooth devices (Bluetooth Version 4.0) Waterproof and Sweatproof - IPX6 Sport MP3 Player for Recreation or Exercise (not suitable for underwater use) 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 (200mAh), 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 to ensure the perfect fit for your ears.