Function : 1. Early Warning System: This alarm can alert you to intrusions and increases security on private property, campsites, farms, barns or restricted areas. 2. 360º Coverage: Multiple trigger wires in one device provide 360º coverage with a trigger alarm that sounds loud when the alarm is active. 3. Reusable Design: The circuit trip alarm is unlimited and reusable and can be installed in paths, entrance areas, connected to doors, gates, etc. 4. Easy to hide: the alarm is olive grass color which is perfect for heavily wooded areas and can be easily hidden. 5 . Simple connection: The alarm device can be easily attached to a tree, post or frame with screw holes or a zip cut-out. Specification: Item Type: Circuit Trip Alarm Material: alloy aluminum Item Size: Approx: 4.7 x 2.5 x 9.6cm/1.85 x 0.98 x 3.77in (height adjustable) Package List: 1 x circuit trip alarm 1 x iron sheet 1 x pull ring note : 1. 2.