General Spec Function provide a stable support for device and  charge your iPhone and sync data Compatibility iPhone 4G Features Small and light, easy to take away, charge your iPhone and sync data. Elegant and compact designed white docking cradle, perfect for your iPhone 4G. You can connect the dock to your computer with with the cable that came with your iPhone, then place your iPhone in the dock to sync and charge the battery. Enjoy your music from iPhone by using a stereto audio cable to connet the dock to a stereto or speakers, The cradle charger holds your smartphone firmly in place while providing full access to the keyboard and side buttons.