Square Cover. Plaster Ring, Mud Ring | 4 11/16 in Square, 2 in Raised Single Device Tile Cover | For Applications That Require Good Illumination Levels. Suitable for General Purpose Applications | 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 VdcFurbay Electric Supp