These small, portable adaptors allow you to use at home a plug in car charger with 120 volt AC. Plug the adapter into the wall, then plug one end of the car charger into the adapter's socket, and the other end into the phone to use and charge your phone. It can also be used with appliances which uses 12v. There are 2 different types of these adaptors available: One with 6-ft extension cord, 400 mA output, a Motorola OEM product and one without extension cord, 1000mA, UL Listed.