Hands-free Calling & High Quality Sound The Bluetooth headphones adopt Bluetooth 5.1 chip technology, which provides clearer sound and stable connection, allowing you to hear clear calls, just like you communicate with others face to face. Don't worry about interruptions when publishing music and calls. LED Charging Case & 120 Hours Standby TimeLED charging case with built-in 400mAh battery, Bluetooth headphones with microphone can be fully charged in 1 hour. The headphones are used with the charging case and can also provide 7-8 charges for wireless headphones. Comfortable In-Ear Design The in-ear design can fit the left/right ear more comfortably. The ear hook can be rotated 180 vertically and 360 horizontally, the flexible ear hook is comfortable to wear. It is lightweight and comfortable enough to wear for hours. Mute Function & Active Voice Assistant The mobile phone bluetooth headset supports voice assistants. With a built-in microphone, it also allows you to answer or reject incoming calls and turn off the Bluetooth headset. Easily turn on/off the sound by pressing the mute button. TWO CHARGING METHODS AND CONNECTING TWO DEVICES You can charge your bluetooth headphones with a Type-C charging cable or charging case. It can also connect 2 devices at the same time, keeping your life and work separately. It is ideal for office and driving environments.