Mophie JuicePack Air Rechargeable Battery/Case iPhone 3G/3GS - Black ?

Product Features Offers the Convenience of an Extended Battery and the Full Protection of a Hard Case Smart Battery Technology instructs the iPhone to Always Drain out the Juice Pack airTM first Light LED Battery Status Indicator Built in Overcharge, Short-circuit and Temperature Protection Product Compatibility: Apple iPhone 3G and Apple iPhone 3G S Offers the Convenience of an Extended Battery and the Full Protection of a Hard Case Smart Battery Technology instructs the iPhone to Always Drain out the Juice Pack airTM first Light LED Battery Status Indicator Built in oOvercharge, Short-circuit and Temperature Protection Product Compatibility: Apple iPhone 3G and Apple iPhone 3G S