Product Description Increase your iPhone's battery life with 2000mAh iPhone 3G/3GS back up battery. This iPhone back up battery is known to have the highest battery lifespan on the market. The 2000mAh iPhone 3G/3GS back up battery is differentiated by its new stylish design, which can't be found anywhere else on the market. The 2000mAh iPhone 3G/3GS back up battery is officially certified by Apple Inc. as a "made for iphone 3G(S)" product!Benefits Designed to increase talk, web surf, and text more than twice the amount of the iPhone 3G/3GSStylish design that conform snugly to the iPhone 3G/3GSUse as an external battery and as a concealed protective form-fitting caseUltra-thin, light-weight, low-profile designCompatible with iPhone 3G/3GS Features Colorblackhard-shell caseProduct is officially certified by Apple Inc. - Tenergy product is a generic product, not an original OEM product.- Apple??, iPad??, and iPhone are trademarks of Apple,Inc.- Tenergy is not associated with Apple,Inc.- Tenergy product is not subject to any warranty by Apple,Inc.