Magnetic sensor is a pair of sensor which is the most reliable sensor in security fields used to detect the opening and closing of door/window.It works on the principal of normally closed.(NC )circuit.The wired part of the sensor can be fitted in the frame of door/window.While the wireless part to be fitted in the moveable door/window.When the gap between these two parts exceed from 16 to 18 mm.It works and give signal to control panel to raise alarm in armed condition.Magnetic sensors are available in different shapes such as rectangular sensor,concealed magnetic sensor. Depending upon the type of door/window corresponding sensor can be fitted