Energizer PP-IP4SB iPhone 4S and iPhone 4 Charging Case - 1 Pack - Retail Packaging - Black Flexible case fits securely around your phone and has an optimized opening for camera flash Recharges in 2 hours at 5W 1700mAh lithium-polymer provides reusable and rechargeable power at 5W Blue LED charge light indicates battery life Control charging with the ON/OFF side switch