Alula RE301 Wireless Door & Window Intrusion Sensor - DSC Security System Compatible - Home & Business Security Alarm Sensor for Doors & Windows

Door Window Sensoris a full-featured security transmitter with industry-leading wireless range and battery life. It is typically used to sense opening and closing of doors and windows, but can secure just about anything using its two external contact zones. It will alarm when the magnet is pulled away from the sensor or when an external contact is opened.