... device to device)to the output port of this USB car charger, then charge devices (such as mobile phone, MP3, Camera, ect) by ... out USB car charger when charging finished.Notes1,Please start your car first, then plug car charger, make sure the direction of current output.2,Plug out USB Car Charger ... in future production, please refer to update ones. Mini USB Car Charger for iPhone 4,4S, iPad 2