Use:
1. Open the sound behind the switch, LED lights bright blue light
2. Put the phone flat on the sound, pay attention to the phone with the speaker side of the sound on the back (two back audio audio sensor point)
3. Turn off the sound when idle
4. When the battery is too low, the sound will automatically turn off
5. Power is supplied to the audio through the built-in battery or connected to the USB charging cable. The battery does not work when connecting the charging cable
6. Universal adjust the volume of the phone to adjust the sound volume
Apple, Samsung Mobile Universal