1 Rotate the knob vari VV 3.0V~5.0V 2 ... Voltage: 3.0V~5.0V, by rotating the knob at the bottom;2 LCD Screen show output voltage and ... .2V); 5 Connect the USB line to charger the battery, the LCD blinks 3 times, the device starts charging, the battery indicator shall be ... moving, and the LCD screen ...