The SD200-002 is the master sensor for SK200-002 Guestroom HVAC Energy Management System. This sensor provides a changeover relay contact output for SF200-001 to control the operation of HVAC device according to the occupancy status of the guestroom. Its high/low temperature limit setbacks help to prevent the room getting too hot or cold during an unoccupied period. An optional door or window switch can be connected to shut off the HVAC operation, should any door/window be left open longer than 5 minutes. This sensor can be mounted on wall or ceiling with the provided mounting bracket.