My company has a lobby/waiting room with a litany of products which they have designed on display. We want to buy an iPad 2, install an app that describes the products, and let people in the waiting room walk around and learn about what they see. How should we keep it from disappearing? I'm imagining a little add-on or case with a chip that sets off an alarm when it leaves the room. Anything like that on the market? Obviously nothing with steel cables will do.