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|1. Laser tripwire: You may already be familiar with this concept, but a tripwire is a wire that is stretched taut across a path and triggers an alarm when it is disturbed. Laser tripwires follow a similar concept. The beam of laser light is shined across the path into some kind of receiver on the other side of the path. When the laser beam is broken, the alarm is triggered. This alarm can be located inside the house, or it can even be a text message sent to your cell phone.
2. Laser fence: Laser fences are essentially big nets of laser tripwires. They are set up all the way around the perimeter of a home. Having a laser fence ensures that you are notified whenever someone breaks through the perimeter of your home. Depending on the strength and concentration of the lasers, a laser fence can actually cause physical damage to someone who tries to cross it.