Griffin Technology Reserve Battery Hard-Shell Case for iPhone 4S

The Griffin Technology Reserve Battery Case not only keeps your iPhone protected and close by - it gives your battery a boost as well. Built into this slim, protective case is a long-lived 1450 mAh lithium-ion battery that delivers 5 watts of power to charge your iPhone while you carry it. The included USB charge cable plugs into the case's micro USB connector to top off your iPhone and then charge the case's Reserve battery. An LED indicator reveals charge level at a glance. While it's taking care of your battery, the case is taking care of the back and sides of your iPhone. The Reserve Battery Case fits iPhone 4 models from all providers.