The Stay Out of My Room Alarm is a motion sensor alarm that works in tandem with a wristband to let you know when someone is near something you wish they would leave alone. The cuff can be set for either a flashing light with an alarm, or a silent mode with just flashing lights (which is probably less obtrusive if you’re wearing it in a meeting with your boss). There are two small motion sensors (each one measures just 1/2-inch in diameter and 1/2-inch deep) that can be placed around whatever it is you want to protect. It only has a range of about 100 feet, but then if you’re further away you’re probably not going to catch them red-handed anyway, right? It requires six AAA batteries to operate (not included).
If you or your kid needs one of these, you can pick one up for $39.95 US.
Source: The Gadgeteer