Occupancy Sensor The occupancy sensor is a combination door-switch and room motion sensor powered by 2 AAA batteries that are included in the kit. Once wirelessly linked to Amana® DigiSmart™PTAC, the occupancy sensor monitors the room. When the room is unoccupied, the sensor automatically activates the temperature set-back function on the in-room PTAC. The setback function is a part of the DigiSmart standard Energy Management System (EMS) in the DigiSmart PTAC control board. The DigiSmart EMS software can be set in up to 100,000 set-back combinations to maximize energy savings and is programmed through either the remote thermostat or the platform controller. The sensor communicates to the Amana DigiSmart suite of devices via an encrypted 2.4 Ghz signal using the 802.15.4 standard. For the door sensor to operate, the in-room PTAC must be equipped with a DigiSmart gateway antenna. For more information, please see the links below.