Kensington BungeeAir Power Wireless Security Tether and Battery for iPhone - Retail Packaging - Black Portable BungeeAir fob attaches to your keys or handbag Free BungeeAir app gives you control of the wireless security tether functionality and settings Integrated lithium polymer battery case adds 4 hours of power for talk time to your iPhone 4 Case has a built-in 2-position stand to hold your iPhone in landscape or portrait mode Download the Kensington BungeeAir application from the Apple App store at no extra cost - compatible with iPhone 4