With this GE Door / Window Sensor, alarm systems can be easily installed that provide the highest level of intruder protection available for a home or business. This sensor monitors doors, windows, cabinets, or anything that opens and closes. When used with a compatible alarm panel, the movements detected by the Door / Window Sensor result in an alarm. The GE Door / Window Sensor provides years of trouble-free operation. The advanced circuit technology makes this sensor extremely efficient and reliable. The low current draw, coupled with a high-capacity lithium battery, means an extrodinary 10 years between changes when sensors are used on windows and low traffic openings. High traffic areas typically result in a 5 to 8 year life expectancy. Almost any building can be set up with a GE system because the Door / Window Sensor's small size, flexible mounting configurations, and choice of colors. The wire-free nature of the GE Door / Window Sensor means low installation costs, less installation damage from drilling holes and pulling wires, and less time spent on premises for the installer. Easy System Programming Adding this sensor to a GE alarm panel is as easy as placing the panel in program mode and removing the cover of the sensor. Removing the sensor cover of the GE Door / Window Sensor activates the tamper switch. Activating the tamper switch while the panel is in program mode adds the sensor ID code into the system.