When the power of the charging tank is full｣ｬ the indicator light is not lit<br /><br />Feature: <br /><br />Bluetooth version: V4.1 <br />Type: Bluetooth Headset <br />Brand: Dacom <br />Model: TWS <br />Bluetooth version: V4.1 <br />Drive: 8mm <br />Impedance: 16ohms <br />Power level: Class <br />Working voltage: 3.2V-4.2V <br />Sensitivity: -42db 2db <br />Frequency range: 2.4-2.48Ghz <br />Distance: &lt;10m <br />Profiles: A2DP/AVRCP <br />Compatibility: for devices which bluetooth enables <br /><br />Usage: <br />Long press the power button about 3-5 seconds till you see the indicator light flashes blue and red alternately <br />Set your phone into Bluetooth mode｣ｬ and search the device named <br />Click to pair with the Bluetooth headset <br />Short press button + / - to volume up/down and Long press button + / - to choose next/previous song <br /><br />Package Content: <br />1 pair X Bluetooth Headset<br />1X Micro USB Charging Cable <br />1X User manual<br />1X pc box