Sweatproof design, best choice when you do sports With CSR4.0 APT-X audio decode technology, offering you perfect sound It can connect with two bluetooth devices at the same time Voice command for picking up / rejecting calls Built-in 85mAh battery, increasing your using time Control music and calls from the headphone Allow you answer the phone anytime and anywhere Suitable for all Bluetooth enabled devices Calls hands-free, drive travel more at ease Built in high performance lithium polymer battery Bluetooth Version: V4.0+EDR Chip: CSR V4.0 Operating Range: 10m Bluetooth Profiles: HEP1.6, SHP1.2, AVRCP1.4, A2DP1.2 Noise reduction: CVC6.0 Cable Length: 60cm Charging Time: about 2 hours Talking Time: 5 hours