... 2.0 sync data cable is for your iPhone or iPod directly or through a dock to yourcomputer's USB port ... ) 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 ...