1. [High Accuracy] Perimeter alarm is designed to enhance perimeter security, it protects home, campsite and property by setting a boundary around the area, easy to sound the alarm. 2. [Quick Installation] The trip alarm is easy to set up and responds quickly, it uses a low profile and concealed trip wire, tied to the device itself, when the trigger pin is pulled, there be a loud audible alarm, easy to prevent accidental intrusion. 3. [Multiple Reuse] The perimeter trip alarm is designed to be reusable, with a solid structure, made of matching recycled aluminum and rust-proof body, can be reused infinitely Easily protect your property and personal safety, easy to prevent Accidental intrusion. 4. [Universal design] The trip wire alarm device is designed to be compatible, and can be quickly deployed in passageways and entrance areas, connected to doors, gates, and easily meets your needs. 5. [Protective properties] The tripwire perimeter alarm is designed for outdoor use only, keep away from materials, no intention to harm anything, just make a loud sound to remind you when needed, suitable for daily use. Colour:black Material:aluminum alloy Package Contents: 1 x perimeter trip alarm 1 x trip wire 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.