This product can be used to keep your personal settings of your vehicle when you replace the vehicle battery. You can use it to keep the settings of alarms, present radian stations, clocks, anti-theft radian, present seat positions, keyless entry systems, mobile phones, and other memory related functions. For safety reasons, this product has been designed to have limited output capability which provides just enough power to maintain the memory of the vehicles on-board computer settings and codes. When using this product, plug it into the 12V cigarette lighter socket.