Used to conserve energy and meet Title 24 building energy codes dimming or turning off lights in unoccupied spaces, bi-level dimming occupancy sensors incorporate PIR (Passive Infrared), ultrasonic, and microwave technology. Bluetooth®-enabled version, which can be controlled remotely by Android or IOS device, supports initial set up as well as subsequent sensor adjustments. Microwave version uses Doppler Effect to detect motion and can be installed within fixture housing.