Retractable Sync & Charge USB Cable for Apple iPhone 3G 3GS 4S 4G This Apple iPhone 3G retractable cable is the perfect cradle replacement for Apple iPhone 3G mple and convenient to travel with its dual sync and charge functionality and new innovative retractable design Operating InstructionsGently pull both the Apple iPhone 3G connector and USB connector to extend the cable.Connect the USB end of the cable to your computer and the other end to your Apple iPhone 3G To retract the cable, make sure both ends are disconnected from your Apple iPhone 3G and your computer Then gently pull both ends of the cable, and the cable will begin to retract.