TechTreak

The Lazer Trip Wire works best in low/dark lighting conditions. The complete set can secure about 100 square feet: Pods can be set 6 to 10 feet apart, depending on lighting conditions. You can even connect multiple sets to secure larger areas. It will work with an unlimited number of sets. The Lazer Trip Wire system is a set of three devices that communicate through harmless light beams. Kids can set them up in their doorways or across their rooms, in any configuration. When the invisible light beam is disturbed, a five-second loud alarm will activate. The Lazer Trip Wire runs on six AA batteries. You can get this for only $24.99 at kleargear site