Chamberlain CWA2000 Wireless Motion Alert System for $38.21 Shipped

Chamberlain CWA2000 Wireless Motion Alert System for $38.21 shipped.  Here is a screenshot for your reference.  It alerts with light & sound when vehicles or pedestrians are approaching. It comes with a weatherproof outdoor sensor with adjustable sensitivity control. The system is expandable up to 8 sensors.  Most places have it for about $57.