The offGRID™ Backup Battery Case for iPhone 4 is the thinnest, lightest and most efficient iPhone backup battery case available. This ultra thin rechargeable battery built inside a snug-fitting, low-profile protective case promises to double the battery life of your iPhone 4. Simply plug in the included micro-USB cord to store the power, unplug at full charge, and enjoy longer life.
• Weighs just 2 ounces—only 9.6 mm thick
• The power/status button and glowing blue lights allow the user to turn the battery on/off and determine the charge level quickly
• Offers up to double the battery life and 1450mAH capacity