Rooftown electronic flameless lighter is powered by rechargeable battery. The battery could be used hundreds of times (Please charger product before the battery runs out, that could extend battery’s usage life). Method of Application: Connect to USB interface with output voltage of dc 5v, such as computers cell phone charges portable source etc. The first use or not use after long time, please charge about 1 hour prior to use. Discharge protection is built inside. When charging, LED is bright and LED is extinguished when it is full.