The $220 unit creates a set of sweeping red laser walls that appear as if they’re constantly scanning back and forth in a room, looking for intruders. However, in reality, the system’s not actually able to detect anything. It’s all just a ruse intended to make a would-be intruder think twice about breaking into your home. Unless the perps make a Mission Impossible-like entrance, they’ll probably just move onto your neighbor’s house instead of your own, it won’t work.”]
Source: https://gizmodo.com/protect-your-home-like-a-top-secret-government-facility-5929787