[High Quality & Reusable]: Made of aluminum alloy, the perimeter alarms are spring triggered, reloadable, and endlessly reusable for your property and personal security. Trip alarm reliable for thousands of uses. The perimeter tripwire alarm device can calm your mood and 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. [Rapid Deployment]: It can be deployed quickly across paths and entry zones, attached to doors, gates, and more - Deploy to keep coyotes from livestock; You can install the trip alarm device around campsites, farms, barns, or restricted areas for protection against unwanted intrusions. It is easy to set up and is a cost-effective solution for alerting you to trespassers. [Wide range of applicability]: This versatile, re-usable trip line activates a 12ga blank or optional pepper gas and flash bang rounds. Also available with 209 primer and .22 Ramset adapter. (They are not included) [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. style: With accessories Material: aluminum alloy colour: ArmyGreen Package Contents: 20 set x Perimeter Trip Wire 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.