... iPod directly or through a dock to yourcomputer's USB port for efficient syncing and charging or to the Apple USB power adapter ... (notincluded) for convenient charging from a wall outlet.Compatibility: For iPod Nano 1G, 2G, 3G, iPod Classic 3G, 4G ... , 5G, 5.5G, 6G, iPhone, iPod Touch Approx. 3 feet (1 meter) long No external power supply required ...