Bluetooth-compatible 5.1 chip, lower power consumption, stronger signal transmission 14mm large moving coil, a broader sound field creates an experience of sound in its environment Built-in call noise reduction technology can efficiently filter noise and automatically detect your voice activity status, and intelligently identify the environment Through IPX7 life-class waterproof and nano sweat proof test, no fear of rain from outdoor sports and sweat from the gym 270\u0026deg; rotatable ear hook, left and right ears can be switched freely Clear distribution of function keys, all controls are at your fingertips, convenient and fast Specifications: Bluetooth-compatible version: V5.1+EDR Chip: JL 6973D Supported protocols: AVRCP V1.6\/A2DP V1.3\/HFP V1.7 Simultaneous LE and BR \/ EDR Use\/play time: about 6 hours (80% volume) Standby time: 180 hours Charging time: about 1.5 hours Distance: 10m Net weight: 85g Battery: Headphone: 100mAh, Charging Case: 500mAh