1. Early Warning System: This alarm can alert for perimeter incursions and enhances perimeter security on private property, campgrounds, farms, barns or restricted areas. 2. 360 Coverage: Multiple trip wires on a single unit provide 360 coverage with a trip alarm that sounds loudly when the alarm is activated. 3. Reusable Design: Perimeter trip alarm is unlimited and reusable and can be installed in paths, entrance areas, connected to doors, gates, etc. 4. Hidden: The alarm is in the color of olive grass, which is perfect for heavily wooded areas and can be hidden. 5. Simple Connection: The alarm device can be attached to a tree, post or frame through screw holes or zipper cutouts. Colour:mechanical gray Material:Metal Package Contents: 1 x Perimeter Trip Alarm Kit 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.