Product Feature: 180 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 12g weight,stable and comfortable.Support adjust volume and change musiccapacity of the headset: 220mAhNoise Reduction: CVC 8.0Working voltage: 3.7VCharging voltage: DC5VCharging Time: about 1 hoursTalking time: about 20 hoursMusic time: about 15 hoursFrequency response: 20 - 22kHzProducts include1 * Bluetooth headsets;1 * Charging cable;1 * User Manual;