Children can set up an invisible spy perimeter to protect your top secret toys - just like banks and museums use! Cross an invisible beam and the alarms sounds!Intruders can’t see the beams but you can with the stealth spray mist. Once the alarm is activated, it lasts for approximately 5 seconds and is loud (48 db). The complete set can secure about 100 square feet. You can even connect multiple sets to secure larger areas. Pod light beams are as safe as a flashlight.Includes 3 lazer unit