Magnetic Dry Pipe Switch Sensor

A sealed glass reed switch that closes when a magnet comes near, the sensing element behind almost every door and window alarm contact. It works through wood, plastic and glass, needs no power to hold its state, and has no exposed contacts to corrode. Mount the switch on the frame and the magnet on the moving part, and the module reports open or closed on a single digital pin. Works through wood, plastic and glass; Sealed contacts resist dust and moisture; No power needed to maintain state; The standard element for door and window sensors