The Aleph XP Series Passive Infrared Detector is loaded with unique innovations which give you reliable detection and freedom from false alarms. Superior white-light and RFI immunity, SMD circuitry, and unique copper-plated circuit board provide outstanding performance and sensitivity. The low-cost XP Series Passive Infrared Detector incorporates a fully tested dual pyroelectric element, jumper electable 2/4 pulse count, and a walk-test LED. This detector is pet-immune up to 30lbs and has a coverage of 40ft x 50ft and 30 detection zones.