PopCharge Auto Duo converts a cigarette lighter socket into a USB power source. Charging adapter uses a vehicle's auxiliary power port to keep USB devices and other portable devices charged and ready while on the road. Two USB ports are capable of charging tablets, smartphones, digital cameras, music players and more. Built-in, surge protection system guards connected equipment from unexpected, vehicle power fluctuations. If input voltage, internal charger temperatures or vehicle battery power get too high, it automatically shuts down to help protect your connected device from damage. Converting 12 volt into 5 volt DC power for USB accessories, the easy-to-install adapter provides power where needed and fits most vehicle auxiliary power ports. Self-contained, all-in-one design is ideal for travel with no external cables required. Adapter also features plastic housing, LED power indicator and spring-loaded contacts to ensure a good, reliable connection.