Apple iPhone 4 Dock MC596ZM/BCharge and sync your iPhone 4 or iPhone 4S with the iPhone 4 Dock. Your iPhone sits upright in the dock as it syncs or charges, so it's perfect for a desk or countertop. It features a convenient audio line out port that connects to powered speakers. It supports other iPhone 4 accessories, such as the USB Power Adapter. You can even conduct speakerphone calls with your iPhone in its dock. Here are some ways you can use the iPhone 4 Dock: Connect the dock to your computer with the USB cable included with your iPhone to sync iPhone and charge its battery. Connect the dock to an electrical outlet using the Apple USB Power Adapter (included with your iPhone) to charge the battery. Place your iPhone in the dock and enjoy clear audio during speaker phone calls thanks to special audio porting. Important note: The iPhone 4 Dock is compatible only with iPhone 4 and iPhone 4S. It will not work with any other iPhone model.