* CSR BT 4.0 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 HD microphone and hands-free function, it can truly free your hands.* Built-in 150mAh rechargeable Li-ion battery supplies you with long standby and working time.* Sound reminder function, easy to set the device according to sound reminds.