This item cannot be shipped to the following state(s): GU,PR,VI
The Chamberlain Motion Sensor with Wireless Motion Alert features adjustable sensitivity. The sensor may be placed up to 1/2 mile from the base unit and detects motion within a 30 ft. radius. The base unit alerts you to intrusion with light and sound. The entire system is expandable up to 4 sensors. Battery backup is provided for continued function during utility outages.