Features: Bone conduction headphones--Works by vibrations, sound transmit by cheekbone to your inner ear. Open-Ear design helps you stay alert to your surrondings, avoid danger meanwhile enjoy music Bluetooth-compatible 5.0 quick pairing-- The latest Bluetooth-compatible 5.0 technology bring faster wireless paring with your device, more stable connection and 10m/33ft signal(No barrier space) Sweatproof-- Ergonomic design for comfortable wearing make sure you do sport freely and do not worry about falling out. IPX4 waterproof to resist light rain and sweat for sports. Material: ABS + PC enable the headphone lightweight but durable Battery-- Build in 120mAh battery. Full charge take 2 hours, standby time 2000h and play time around 5 hours. Suitable for outdoor or indoor activities Specification: Connection distance: 10M Battery capacity: 120mAh polymer battery Playing time: 5h (80% volume) Connected standby time: 120 hours Shutdown standby time: 2000h Charging time: 1.5 hours Color: black, red, gray Package List: 1 x Bone Conduction Headphones