Works! Used! The Griffin iTrip Auto FM Transmitter Car Charger is a sleek and convenient accessory for Apple devices like iPods and iPhones 4S. With a built-in dock connector, this device allows you to charge your device while also streaming music wirelessly via FM transmission. The car charger is compatible with both black and silver Apple devices and comes in a stylish black or silver color. The Griffin iTrip Auto FM Transmitter is a reliable and user-friendly product for on-the-go music lovers.