This fully portable light is a stand alone battery powered single-flash strobe light with an 87dB piezo alarm powered by a rechargeable battery and wall plug charger. It includes a 9 amp hour battery and will run approximately 20 hours between charges. The battery is contained in a powder painted black steel box with a hinged lid. The strobe is a single flash 12V strobe light with an 87dB alarm underneath. There is no need to remove the battery for charging. Just plug the supplied wall charger into the side of the box when not in use.