Highlights It is not designed in the ear, close to the ear bone, while enjoying fine quality music, it will not harm the ear. Bone conduction open tone, while listening to the song can also pay attention to the outside voice. Mini size and lightweight design, comfortable and stable to wear, it won't hurt if worn for a long while. Large moving coil ecological diaphragm horn with directional audio, lossless transmission. You can easily wear this headset with glasses. Overview BT Version: 5.0 Working Distance: 8-15m Headset Charging-Time: Approx. 90min Indicator Light: Switch pairing: red and blue lights flash alternately Shut Down: The red light is on for 1 second Completion of Pairing: Indicator light off Earphone Charging: Red light is on The headset is fully charged: the indicator light is off Charging Method: Please use 5V/1A chargers, please disconnect the power-supply when fully charged.