Classroom Lighting Control has never been more cost effective than with the CMR-PDT-10-2P. This sensor provides Dual Technology detection up to a 40 by 40 classroom, and can handle A/B (Inboard/Outboard) switching. On a typical 9 foot ceiling, simply mount a standard round fixture box 20 feet up and in from the door. This sensor requires NO CALIBRATIONS! The time delay is factory set at 10 minutes (adjustable up to 20 minutes). In new construction, simply use the sensors mounting box as the main junction for the wiring. In retrofits, the universal mounting allows for standard mud rings, or surface raceway enclosures, allowing the sensor to be wired before or after the switches. For smaller rooms or higher ceilings, consider the CMR-PDT- 2P. For areas with abundant natural light, each pole can be inhibited based on sunshine by using the CMR-PDT-10-2P-P. In cold damp environments like locker rooms, use the CMR-PDT-10-2P-LT.