Features: 1.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 ensure your safety. 2.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. 3.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 Ramset adapters. 4.DURABLE 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. 5.OUTDOOR USE: Trip wire alarm device is for outdoor use only, keep away from flammable 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. specification:Item Type: Perimeter Trip Alarm Material: Metal Product Size: Approx. 11.7 x 3.1 x 2.4cm / 4.6 x 1.2 x 0.9in Function: Guard Home, Campground and Property PackageList:1 x Set of PerimeterTripAlarm (2pcs) 1 x Card Pin NoteManual measurement, please allow some errors.