Chamberlain Group CWA2000 Chamberlain Driveway Alert, Black

Set includes one base receiver and one sensor (ability to additional CWPIR sensors sold separately) Passive infrared (PIR) sensor is weatherproof and detects motion up to 30 feet away and features adjustable sensitivity Base receiver detects signals from sensors up to a 1/2 mile away (in ideal situations) Unique sound and light pattern on the base unit identifies which sensor has been triggered Easy to install, no wiring required. Base units uses AA batteries or included AC adapter; Note: Check user manual in technical specification before use