Upgraded High Quality & Reusable: Made of high-quality material, the perimeter alarms are spring triggered, reloadable, and reusable for your property and personal security. Protect Farms, Camp Site.Trip alarm reliable for thousands of uses.Help you spend every night with peace of mind Easy To Use: Easily attached to trees, posts, or frames via the screw holes or zip tie notches. The alarm signaling device uses a low-placed and concealed trip wire, tethered to the device itself which creates a loud audible alert when the activator pin is pulled. We include: 4 pcs 4mm x 40mm screws, which are convenient for you to install directly and effectively Rapid Deployment: You can install the trip alarm device around campsites, farms, barns, or restricted areas. is easy to set up and is a cost-effective solution for alerting you to trespassers.Note: Perimeter Trip Alarm Just Designed To Make A Loud Sound To Remind You To Keep Safe, Doesn't Hurt Anything Wide Range Of Applicability: This versatile, re-usable trip line activates a 12ga blank or optional pepper gas and flash bang rounds. We bring a .22 adapter for you to use. And you can use the 209 primers with a 209 adapter, 308 blank with a 308 adapter for this device(Note: These accessories are not included, but you can buy it in other stores) Make Sure This Is What You Want: Our devices are not meant to harm anything, just to create a loud noise to alert you when you need it. Double check to ensure this is what you want.The perimeter trip alarm system is for outdoor use only, keep away from flammable materials, and use it with caution. The end user assumes all risks and liability for using this product Color: As Shown Material: Metal Package Contents: 2 pcs x trip wire