* 4.2 Version of CSR BT chip allows you to wirelessly listen to music with this Hi-Fi headphone.* Fashion design, available to be detachable when you want, let music surrounding your life any time.* With microphone, hands-free and automatic call answering functions, you can enjoy wireless talking while driving.* Built-in 180mAh rechargeable Li-ion battery provides you with long standby and working time.* Power display function on your smartphone shows the residual amount of the battery at any time.