Profile: Pro Securitys specializes in security equipment and security cameras. Our DA-4DG is a gray door station that connects via two wires to master DA-1MD's. This DA-4DG features a 12V AC output for door strike connection, selective call buttons and illuminated directories. We supply a handset set that contains a master and sub handset. This system is powered by either a six volt DC power supply(Skk-620) or by using 4 AA batteries. We distribute branded items that include Tamron, Tatung, Telexper, Toshiba, Totevision, Trangobroadband, Vicon, Videocom and Vigitron.