V-Plex is the patented polling loop technology that literally defines price and performance on a simple pair of wires. By utilizing two wires instead of four, V-Plex offers significant advantages over home run wiring or the conventional four-wire multiplex providing economical expansion of peripheral devices and point identification to your central monitoring station. Detection range 15m x 18m. Adjustable pet immunity. Digital signal processing. Zone input for SMB-10T tamper contact. Front and back tamper.