Kensington K39291US BungeeAir Power Wireless Security Tether and Battery for iPhone 4 for $63.24

An essential 3-in-1 accessory for your iPhone: wireless security tether, battery, and case. Learn more BungeeAir takes a smart, safe, and simple approach to provide the first line of defense to keep your iPhone from being left behind or stolen. The smartest way to keep this valuable asset safe is to simply keep it with you. BungeeAir is based on extremely powerful and efficient wireless technology that instantly creates a connection between your phone and a compact key fob to create a security tether, keeping your phone and fob aware of each other's location.