1.Hands Free Call: Sound. The earpiece adopts the bluetooth 5.1 chip technology, which provides more clear sound and stable connection, allowing you to hear crystal clear calls like you are communicating face to face with others. Don't worry about interruptions on listing to music and calling. 2.60H Playtime: Built in 500mAh battery LED charging case, the headset with microphone can be fully charged in 1.5H. The headset can be used continuously for approximately 60 hours with the charging case, but also provide 5-6 charging times. 3.Comfortable Wearing Design: In ear designed can fit in left/right ear more comfortable. Earhook rotation of 180° vertically and 360° horizontally, the flexible ear hook for a comfortable fit. It is lightweight and comfortable enough to be worn for hours. 4.Mute Function & Active Voice Assistant: The Bluetooth headset for cellphone supports voice assistant. Built in microphone, it also enables you to answer/reject calls and mute on. Easily mute/unmute with the press of a mute button.