The Lutron LRF2-VCRB-P-WH Radio Powr Savr Wireless Vacancy Sensor can control up to 10 compatible dimmer and switching devices to provide optimal energy savings. Using battery-powered passive infrared (PIR), the vacancy sensor senses body heat and fine motion, then automatically shut off lights by communicating with devices via radio frequency (RF). Dependent on mounting height, the Lutron LRF2-VCRB-P-WH Vacancy Sensor can provide a 360º field of coverage up to 676 square feet,