Chamberlain CWA2000 Wireless Motion Alert System
The Chamberlain Motion Sensor with Wireless Motion Alert is a convenient and affordable safety / security system. It features weatherproof outdoor sensor with adjustable sensitivity control. The sensor may be placed up to a ½ mile from the base unit. Alerts with light and sound when vehicles or pedestrians approach within a 30 feet radius. Expandable up to 4 sensors, it is perfect for home, business, property and worksite.