LYLGO 2 Sets MC33CNormally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch Home Security Burglar Alarm System

Package Included 2 Sets x Alarm Magnetic Reed Switch Application The door contact sensors work as an antitheft alarm ideal for metal door and window Easy To Install Have small screw terminals which makes it much easier to wire Closed loop magnetic contact that features a terminal block style connection for accepting wire Contact Type NC means Normally Closed When the magnet together the circuit is conductive light on When the magnet separate the circuit is not conductive light off Has many uses MC33C Door Contact Sensorsthe door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system.