The Model MSS2757 High Security Magnetic Contact with recessed stainless steel ANSI door plate is built with Flair’s time tested high security technology. The contact is SPDT with triple bias reeds. Trying to defeat the switch with an external magnet will trigger an alarm. This magnetic contact also comes with tamper loop which will trigger alarm if the wires are cut. There are five color coded wires. The MSS2757 is a low cost alternative to other high security contacts on the market and is used in government and high security commercial facilities and jails around the world.