1. Wireless specification：Wireless V4.1 BK3266 2. Support protocol: Headset Hands-free A2DP Avrcp 3. Charging voltage DC5V charging time is about 2 hours 4. Battery capacity: 70mAh; line length: 55cm; net weight: 12g 5. Call/music time: 3 hours; standby time: 75 hours 6. Battery display <Support for Apple phones and some Android phones> 7.Voice prompt switch：When not connected, double-click the multi-function button and there will be a beep
