GooDGo(TM) Premium USB 2.0 Type A Male to 30-pin Dock Extension Spring Retractable Cable for iPhone 4/4s iPad 2/3 (Black) Saves space, and avoids knots & tangling Compatible with iPod 4S/4/3GS/3S/iPod/iPad mobile devices for data sync and charging Good product and have one year warranty Charge your device using the computer's USB port