Normally open reed relay door contact. Has screw terminals. Includes terminal cover, mating magnet and four mounting screws for wood. Door contacts are used for alarm system monitoring and with access controls to prevent anti-tailgating, and to monitor the state of the door. White in color, sold individually. Dimensions of the switch section with cover: 2-1/2" long x 3/7" wide. 12V, 100mA. S&L Select items are value items that are screened, imported and supported by Shop&Lock for performance.