1. Warning system: This alarm can issue an alarm for surrounding intrusion and enhance the security of private property, camping sites, farms, barns, or restricted areas. 2. 360 coverage: Multiple trip wires on a single unit provide 360 coverage, and a trip alarm will emit a loud sound when activated. 3. Reusable design: The perimeter trip alarm is and reusable, and can be installed in paths, entrance areas, connected to doors, gates, etc. 4. Easy to hide: The alarm is in the color of olive grass, which is very suitable for areas with dense trees and is easy to hide. 5. Simple connection: The alarm device can be easily connected to a tree, pillar, or frame through screw holes or zipper cuts. Colour: Black Material:Metal Size:40x80mm Package Contents: 1 * Perimeter 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.