Neotek Iphone 3G 3Gs External Solar Battery Charger Case Power Pack Black By Coolshop (Only from Coolshop Be Aware of Imitations) Smart Battery (Optimized to lengthen your iPhone performance time; No more out of power dilemma during important internet surfing or video chatting sessions) Solar panel can be constantly charged for the battery under sunshine. One hour of directly sunlight can charge the iPhone for 30 Mins talk time in 3G network and 60 Mins talk time in 2G network USB charging and SYNC without the need to disconnect your iPhone from the case (Mini USB cable included in package 4-LED indicators show you battery status. Each light means 25% power inside. ON/OFF Button for Optional Power Output Control