The electronic cigatette lighter is powered by rechargeable battery.The battery could be used hundreds of times.(Please charge product before the battery runs out, that could extend batterys usage life.)Method of application: Connect to USB interface with output voltage of DC 4.5 to DC 5.5V, such as computers, cell phone charges, etc.The first use or not use after long time, please charge about 3 hours prior to use.Discharge protection is built inside.The indicator will light on when charging and will light off when battery charging completed.