Connection: Bluetooth 4.2 + EDR class 2 Bluetooth profiles: A2DP 1.3, HFP 1.6, HSP 1.2, AVRCP 1.6 Bluetooth range: Up to 10m Built-in 65 mAh rechargeable Li-Polymer battery Charging Box Capacity: 300 mA (Fully charge the headset twice) Charging time: Up to 2.5 hours Playing time: Up to 3 hours Standby time: 100 hours Clear and clean sound with advanced CVC 6.0 active noise cancellation technology Supports hands-free function, shape and stabilizer are designed to ensure a secure and comfortable fit