Product Feature: 360 degrees rotating design, suit for left and right ear. bluetooth V5.0 chip,stable singal transmission. Bluetooth transmission distance: 10 meters. Creative hook design and only more→14g weight,stable and comfortable. Support adjust volume and change music Battery Capacity: 55mAh Noise Reduction: CVC 6.0 Working voltage: 3.7V Charging voltage: DC5V Charging Time: about 1 hours Talking time: about 2 hours Music time: about 3 hours Standby time:about 480 hours Frequency response: 20 - 22kHz