Bluetooth headset is a short distance wireless communication technology using by low radiation, you can easily make and receive calls while traveling, working or driving by connecting the headset to support bluetooth wireless technology compatible w/ cell phone. Before using it , please read the instruction carefully in order to know the way to use it in safe and know maintenance information. You can connect to a compatible communications equipment without using cables by bluetooth wireless technology; Maximum distance between device and bluetooth headset should not exceed 10 meters. Bluetooth connection may be obstructed by walls or other electronic devices, and distance connections may also be shortened.