Additional PIR sensor works with Chamberlain CWA2000 base receiver (Sold Separately) Weatherproof outdoor sensor with adjustable sensitivity control Detects motion up to 30 feet away with wide 120-degree angle coverage Transmits signal to base station (Chamberlain CWA2000) up to a half-mile away in ideal situations Easy Installation / easy operation. 2 year battery life. Includes mounting bracket Chamberlain wireless motion alert add-on sensor for the wireless motion alert system (CWA2000 - Sold Separately). PIR sensor detects motion up to 30ft away and features adjustable sensitivity so small animals can pass undetected. Wide 120-degree angle coverage. Two year battery life. Comes with mounting bracket. Half-mile range with CWA2000 base unit (sold separately).