SpyNet Laser Trip Wire
Keeping the dog out of the garbage can or your cat from going through your underwear generally calls for a lock and key scenario. But that’s hardly a geeky answer and won’t condition Rex to think twice before he digs through bacon grease and chicken bones.
The system includes a transmitter that beams a laser to a receiver unit, as well as 2 mirror units to expand its reach around corners and through door ways. If someone, or something crosses its path an audible alert will be sounded, notifying you that there is an intruder in your midst. You’ll need 6 AAA batteries to power this setup, but they should last up to 5-10 hours with continuous use, at least that’s our best guess based on our laser experience.
ThinkGeek sells it for $34.99.