Iphone 4 dock

With the iPhone 4 Dock, you get easy access to a dock connector port for syncing or charging, and an audio line out port for connecting to powered speakers via an optional audio cable. The iPhone 4 Dock also works with other iPhone accessories, such as iPhone AV cables and the USB Power Adapter.

Charge and sync your iPhone 4 with the iPhone 4 Dock. Your iPhone 4 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 iPad accessories, such as iPhone AV cables and the USB Power Adapter. You can even conduct speakerphone calls with your iPhone 4 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 4 to sync iPhone 4 and charge its battery.
Connect the dock to an electrical outlet using the Apple USB Power Adapter (included with your iPhone 4) to charge the battery.