... by rotating the knob at the bottom;2 LCD Screen show output voltage and electric quantity;3 ... 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 shall be turned off when it is full ... stops working;8 Short circuit protection: LCD Screen shows “F2”; 2013 LCD Display with knob switch Mini VV Ecig ...