Duracell Powermat Wireless Battery Case for iPhone 4/4S - White Works as a protective case for your iPhone 4/4S Use with Powermat to wirelessly charge your iPhone 4/4S Powermat sold separately Compatible with Duracell Powermat for 1, 2, or 3 devices Attaches easily and has a flip top for easy removal Allows micro-USB access for sync to your computer (includes USB cable).