1.This camping trip alarm can be installed on campgrounds, farms, gates, restricted areas, and more.It enhances security of your property and your surroundings.Prevent dangerous animals from approaching.(Note: Our equipment 't hurt anything, it's just to make a loud sound to remind you to stay safe) 2.Install the sirens on a tree or wall.The driving alarm safety device uses low and hidden tripwires, tied to the device itself, and produces a loud audible alarm when the activator pin is pulled out.The peripheral alarm is triggered by a spring and can be refilled and reused endlessly for safety. 3.Made of 6061 aluminum, triggered by peripheral sirens springs, reloadable for endless reuse, protecting your property and personal safety.This peripheral tripwire alarm device should not be missed by every camping travel enthusiast or anyone who needs to effectively protect their property. 4.The peripheral driving alarm system is for outdoor use only, away from materials, and be careful.Its design is only suitable for non-lethal blanks.Always low to the ground and always point down when installed. Color: As shown Material: Metal Package Contents: 2pcs x Perimeter travel alarm 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.