The Ness Security Guard III is the only professional alarm system you can INSTALL YOURSELF!!! It is the world's smartest wireless intruder alarm system. SecurityGuard III from Ness Security is a unique fully self contained control panel with an onboard 15m PIR, LED user display, high volume siren and anti-tamper protection.There are no wires to install, not even main power. It simply attaches to the wall using only 4 screws... Thats it!!! Complete with 2-year manufaturer's warranty.