Feature: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. 360º Coverage: Multiple trip wires on a single unit provide 360º 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. Easily Hidden: The alarm is in the color of olive grass, which is ideal 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 through screw holes or zipper cutouts.Specification:Item Type: Perimeter Trip AlarmMaterial: Aluminium alloy.Product Size: Approx: 4.7x2.5x9.6cm/1.85x0.98x3.77in(height adjustable)Package List:1 xPerimeter Trip Alarm1 x Iron Sheet 1 x Pull RingNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.