TSL1-A is designed primarily with the short term towing industry in mind. It is a totally self contained strobe light in a compact housing. The base of the light contains a sealed lead acid rechargeable battery. Included is a 12V to 12V solid state charger for use with a cigarette lighter receptacle, a built in on/off switch, and a 90 lb. pull magnet. Each charge will last 2-3 hours.