This combined holder / charger will ensure that your battery stays fully charged and your phone is secure in the car. Four sprung clips ensure that the unit is retained securely in the cigar lighter socket. These top quality branded units offer overload and surge protection to avoid accidental damage in the event of the car being started with the power cord still connected. Compatibility: iPhone, 3G, 3GS, 4 4G HD, iPod 3G, iPod 4G, iPod Classic, iPod Color, iPod Mini, iPod Nano, iPod Nano 2G, iPod Nano 3G, iPod Nano 4G, iPod Photo, iPod Touch, iPod Touch 2G, iPod Video