EC TECHNOLOGY 1800mAh New fashion design with the whole aviation materials metal aluminum alloy, Mini Stereo subwoofer ,LED lights, Rechargeable, Portable Battery Blue color protective Case & Extended Battery for iphone4, iphone4s(Fits All Models iPhone 4S /4)-Retail Packaging All-metal aluminum alloy material, the use of aviation materials, durable extended battery case for iPhone 4 4s - 1800mAh On the back with a stereo subwoofer, extraordinary sound Blue LED light , full of technology sense Don't need an additional data cable, you can use your mobile phone original data cable 6 month product replacement warranty