Shotshell primer perimeter alarm system with Kevlar tripwire and my added touch, a modified junction box for weather housing and holes to feed vines or camouflage netting through. : r/Survival
DIY Mousetrap and Cap Tripwire Perimeter Alarm – SurvivalKit.com
DIY TripWire Alarm Very Simple and Outrageously Loud (High Security Perimeter) | Home security tips, Home security systems, Tripwire
Ideas to keep people off my property | Sniper's Hide Forum
Perimeter Trip Wire Alarm Device 12 Gauge Accessories with .22 Option Early Warning Security System for Camping and Security : Amazon.co.uk: DIY & Tools
How To Make A Perimeter Alarm System - Post Apocalyptic Life Hacks - YouTube
How to make a TRIP-WIRE ALARM - YouTube
REMFLY Perimeter Trip Alarm, 12 Gauge Camping Trip Wire Alarm Device, Early Warning Security System for Camping and Property Safety : Amazon.co.uk: DIY & Tools