The Watt's Stopper's CI-200 and CI-205 are passive infrared occupancy sensor which provide 360 degree coverage. The sensor's low-profile design ensures a clean and uncluttered ceiling appearance suitable to any modern office. The sensors work as part of an integrated system of lighting control with other Watt Stopper occupancy sensors to reliably control lighting in a variety of applications. Built-in light level sensor in CI-200 Adjustable sensitivity & digital time delay CI-200 contains an isolated relay for use with HVAC or other control systems ASIC enhances reliability and helps to eliminate false triggers UL and CUL listed Specifications: CI-200 contains isolated relay with N/O an N/C outputs; rated for 1 Amp at 24 VDC Red LED indicated occupancy detection Integrated light level sensor - works from 4 to 190 foot candles 3.3" diameter x 2.2" deep (85 mm x 56 mm), extends approximately .36" from ceiling. CI-200-1 PIR sensor; light level, isolated relay; High Density / Reduced Range Lens, 24 VDC, 20 mA, up to 500 sq. ft., 360 degrees