Feature: ['Intelligent, continually adapting sensor Ultrasonic (US) combined with passive infrared (PIR) sensing provide high sensitivity, high noise immunity, and excellent false tripping immunity Suited for complex environments that are difficult to control with single-technology sensors Flexible base mounting on wall or ceiling Aim and lock: base mount permits fast alignment Non-Volatile Memory: settings saved in protected memory are not lost during power outages 1,600 sq. ft.. coverage when mounted at'] (Page 1)