Chamberlain telecommunication on the job constituent sensor for the telecommunication motion on the job system -LRB- CWA2000 - Sold Separately -RRB-. PIR sensor motion up to 30ft away and features adaptable sensitivity so least animals can pass undiscovered. Wide 120-degree angle. Two year battery. with mounting bracket. Half-mile with CWA2000 base unit -LRB- sold separately -RRB-.