Kensington PowerLift Backup Battery and Dock for iPhone 4 and 3G 3GS - Charger - Retail Packaging - Black

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Power dock with kickstand lets you watch videos and enjoy FaceTime chats hands-free.
1200 mAh delivers the charge you need for extending music, video and FaceTime chats.
Built-in dock connector for iPhone and USB cable so there are no parts to lose and protected when stored -- everything you need is built right in.
Two position charging: In-hand use for phone conversations and docking for charge, sync and FaceTime
Works with most cases
1200 mAh delivers the charge you need for extending music, video and FaceTime chats
Adds up to 20 hours of music, 5 hours of video, 3.5 hours of talk, and 1.5 hours of FaceTime (based on iPhone 4)
Built-in dock connector for iPhone and USB cable so there are no parts to lose and protected when stored,everything you need is built right in
LED battery indicator light tells you how much power you have left
Power dock with kickstand lets you watch videos and enjoy FaceTime chats hands-free