|BungeeAir Power is a backup battery-equipped iPhone 4 case that pairs with a wireless key fob for a number of security options. Attach the BungeeAir fob to your keys or purse and never lose or forget your iPhone again. When you and your phone are separated, the iPhone screen locks automatically and sends an alert to the BungeeAir fob. The built-in Li-Po battery provides up to 4 extra hours of talk time. Requires iPhone 4/4S, not included. Requires free app download.