Rolling Door Guard Against Theft&Alarm System Feature: Independence: It will emit ringing alarm voice.when the rolling door was be unclenched 2cm. The magnet of door will send signal to host computer which will give an alarm and auto dial telephone to tell the Master that some theft enter the shop,garage and warehouse...etc. Easy to install. Application: Store,Carbarn and so on. Foreground of Market: With great Foreground of Market.It meet any country.province,county and so on.