Never let your treasured iPhone, iPod or iPad run out of battery again with this handy USB (Universal Serial Bus) charging cable keyring, which can also be used to sync to i Tunes. The iPhone keyring is the size of an ordinary key & can be kept on you at all times for those emergency charging situations. When the cable is not in use, simply wind the cable up into the unit so that there is no mess or dagling wires. The iPhone USB (Universal Serial Bus) Charger keyring is compatible with iPhone 3G, 3GS, 4 & 4S. It can also be used with iPad, iPod Touch & Nano.