The Wattstopper CI-355 is a passive infrared (PIR) line voltage ceiling occupancy sensor designed for center-mount installation in offices, conference rooms, and commercial spaces requiring automatic lighting control. Operating across 100347V AC, it delivers 360 coverage up to 1,200 ft for broad detection in open-plan environments. The sensor automatically switches lighting on and off based on occupancy, supporting energy code compliance in both commercial and institutional applications.