The OSFHU high-bay occupancy sensor is specifically designed for high mounted areas such as warehouses, manufacturing and other high ceiling applications. The OSFHU installs directly to an industrial fluorescent luminaire or an electrical junction box. It is a self-contained sensor and relay that turns individual light fixtures on or off based on occupancy in the detection zone. It comes with three interchangeable lenses for use in either a 360-degrees high-bay or 360-degrees low-bay general area or an aisle way. The OSFHU provides reliable coverage up to 40 ft. Mounting heights. The OSFHU is also available in a model for cold storage applications with temperatures as low as -40-degrees f. To improve the field-of-view for deep body fixtures, a separate offset adapter accessory (OSFOA-00W) can be used to position the sensor below the fixture body. The adapter simply snaps into a 1/2-inch knockout on the end of the industrial fixture to attach the sensor. Item Description High-Bay Fixture Mount Occupancy Sensor, 360 and Aisle way (360 degree lens and Aisle way lens included), Passive Infrared Technology, Commercial Grade - White California Title 24 Compliant.