The Seidio Surface Plus Hard Battery Case for iPhone 4 and 4S (Amethyst) is the right case for sleek protection plus additional battery life for iPhone 4/4S. This case protects your device from scratches while also providing you with up to 6 hours of additional talk time. Newest innovation adds convenience in addition to power and protection. This rechargeable case also allows you to switch out the battery included in the case with a spare battery to continue powering your device. Durable plastic is accompanied by soft-touch coating which enhances the look of your device without attracting lint, making it the perfect case to protect and power your Apple iPhone 4/4S.