The Perimeter Infrared Intruder Security Alert is a low cost, simple, safe and effective perimeter alarm system. On today’s modern battlefield, there is simply too high a risk of collateral damage to use pyrotechnic perimeter defenses. The Perimeter Infrared Intruder Security Alert allows soldiers to quickly and quietly set up a perimeter detection system that features a 135 decibel alarm as well as flashing infrared LED lights when tripped. The non-lethal Perimeter Infrared Intruder Security Alert allows constant and effective perimeter security that cannot be easily defeated once activated. The PIISA® is a force multiplier, requiring fewer soldiers to operate than command detonated defenses, increasing unit effectiveness while eliminating the chance of civilian casualties. The unit weighs just 2.5 ounces and is easily packaged for rapid deployment.