Features 1. Early Warning System: Enhance perimeter security on private property, campgrounds, farms, barns, or restricted areas, and alert for perimeter intrusions. 2. How It Works: Multiple trip wires are used on a single device to provide a trip alarm with 360 degree whole coverage. When the alarm is activated, it will emit a loud audible alarm. 3. Simple and Reliable: Trip line alarm is easy to set up, simple and effective, yet reliable, and are a cost effective solution to alert you to intruders. 4. Reusable: Tripwire perimeter alarms can be reused indefinitely and can be deployed on any path, entry area, connected to doors, gates, etc. 5. Applications: Olive green color, ideal for wooded areas, can be used in buildings, yards, courtyards and building exteriors, easily attached to trees, posts or frames by screw holes or zipper cuts. Specification Material: Aluminum alloy Color: Dark green Size: 7.6 x 2.5 x 2.5 cm Weight: 130 g Package Include: 1x Perimeter Trip Alarm