How to install rolling shutter door contact

Metal rolling shutter door is installed for garage, shop and it is easy to be pried open. Wireless or wired rolling shutter door contact is the sensor installed for this type metal rolling door. When the door is separated from the ground, it triggers alarm of sound light and send alarm report to home owner. There are three parts of the door contact. Professional technical support for installing burglar alarm fire alarm systems at Retail shopping DIY home security and security service equipment at