PROFESSIONAL: The perimeter trip alarm is a trip wire activated trap warning device that alerts you to any perimeter violation via a trip wire activated alarm system. Get out and stay alert to your safety. APPLICATION: A simple but effective security alarm device you can install around your campsite, farm, barn or restricted area to prevent accidental intrusions. Perfect for camping, hiking and outdoor adventures. WIDELY COMPATIBLE: Versatile, reusable trip wires activate 12ga blank or optional pepper gas and flash bang rounds. Also compatible with 209 primers and 22 for adapters. AND RELIABLE: The perimeter alarm features a recycled aluminum and rust resistant body, reloadable and infinitely reusable, reliable, ensuring the safety of your property and individuals. OUTDOOR USE: Trip wire alarm device is for outdoor use only, keep away from materials and use caution. Our device does not harm anything and is only designed to make a loud noise to alert you when you need it. Function: Guard Home, Campground and Property Item Type: Perimeter Trip Alarm Colour:As Shown Material:aluminum Package Contents: 1 x trip alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.