- "+", On press you can increase the voltage from 3.0~6.0V, when you reaches 6V it starts back at 3.0V.
- "_" , On press you can decrease the volt from 6.0V to 3.0V, when you reaches 3.0V, it starts back at 6.0V
- On/Off, press and hold for 3 seconds to turn on device, press and hold for 5 sec to turn off