Wattstopper’s CI-355 passive infrared (PIR) occupancy sensor automatically turns lighting on and off based on occupancy. The sensor mounts on the ceiling with a flat, low-profile appearance and provides 360 degrees of coverage. Wattstopper's CI-355 passive infrared (PIR) occupancy sensor automatically turns lighting on and off based on occupancy. Detection Signature Processing eliminates false triggers and provides immunity to RFI and EMI Walk-through mode turns lights off 3 minutes after the area is initially occupied – ideal for brief visits such as mail delivery Built-in light level sensor featuring simple, one-step set-up Zero-crossing for long relay life LED indicates occupancy detection