The low-profile DT-300 dual-technology occupancy sensor with light level sensor combines the benefits of a passive infrared sensor (PIR) and ultrasonic technologies. The ceiling mount sensors feature a flat, unobtrusive appearance and provide 360 degrees of coverage. Using SmartSet™ technology, the DT-300 occupancy sensors require no adjustment at installation. SmartSet continuously monitors the controlled space to identify usage patterns. Using this information, the occupancy detector automatically adjusts the time delay and sensitivity settings for optimal performance and energy efficiency. Engineered specifically for building automation systems, BAS, and HVAC applications, the sensor assigns short delays (as low as 5 minutes) for times when the space is usually vacant, and longer delays (up to 30 minutes) for busier times. The DT-305 is a lower cost version of the DT-300 without isolated relay or light level sensor.