The ATU2000C is an adaptive technology ultrasonic ceiling sensor that provides 360° coverage for areas up to 2000 square feet. It features a digital, crystal-controlled ultrasonic transmitter and receiver for superior sensing of minor movements and operates on a 24V DC nominal power supply from a Hubbell CU series control unit. The sensor's adaptive technology automatically adjusts sensitivity and provides a time delay ranging from 8 to 40 minutes, eliminating the need for manual adjustments. Designed for mounting heights between 8 and 12 feet, this device is ideal for automated control systems in commercial environments to enhance energy efficiency.