The Kensington Proximo system tells you if your keys and your iPhone get too far apart.
Kensington has launched a system called Proximo that it promises will alert people when items like keys and iPhones are lost or stolen.
The Proximo kit consists of an iPhone app, a key fob for a keychain, and a third device to track something else like a backpack or car, the company announced at CES. If the items get too far apart -- people can specify the exact distances, which are measured wirelessly using BlueTooth -- they sound an alarm.
The fobs and app each come with buttons that triggers an audible alarm from a paired device to help locate it. And the app offers a map for GPS-based tracking for devices that are out of range.