4" E4 Housing | For Use in Insulated Ceilings | Passive Infrared Sensors That Automatically Control the Lights in an Area. These Sensors Detect Heat From Occupants Moving Within an Area to Deterine When the Space Is Occupied. Combines a Maestro 0-10 v Dimmer With an Occupancy Sensor. Controls 1-10 Vdc | Provide Access for Pulling Conductors; Enable Change in Direction in Conduit Runs; Compact Design Allows Use in Areas With Limited Space; Provide Future Access for Maintenance and Wiring Changes; Compact Design; Precision Ground Flange; Blind Drilled and TFurbay Electric Supp