Size: 50The DW10-2 is a surface mounted Door/Window Contact that can be installed on doors, windows, and many other objects that open and close. The sensor transmits signals to control panels when a magnet mounted near the sensor is moved away from or closer to the sensor. The sensor has an external input that accepts N/C dry contact devices. The sensor is also equipped with a cover tamper for additional security. This sensor comes with an adjustable magnet that can be used for custom sized doors/windows.