Range up to .5 miles. Alerts with light sound when vehicles or pedestrians approach. Perfect for home, business, property worksite. Easy installation/easy operation. Weatherproof outdoor sensors with adjustable sensitivity control. Expandable up to sensors

- Chamberlain wireless motion alert- Alerts with light and sound when vehicles or pedestrians are approaching- Easy installation/ easy operation- Weatherproof outdoor sensor with adjustable sensitivity control- Expandable up to 8 sensors- Includes 1 base unit and 1 sensor - Half mile range from sens...