... Portable External Battery Capacity: 2800MA Work for iPhone 4&iPods&mobiles CE,FCC & RoHS approvel 1:Ideal for long flights, outdoor activities ,or ... out for charging any device that powers from a USB socket such as iPod , iPhone ,Cell phone and MP3 player . 4:Compact ... battery when not in use . Compatible with: iphone 4,iPhone 3G/3GS, ,Cell phone , and MP3 with USBcharging capability or any products ...