The YTH8320ZW1007 includes the TH8320ZW1000 thermostat plus the THP9045A1023 wiresaver module. * Z-Wave delivered messages allows the thermostat to be added to or removed from a Z-Wave controller.Wire saver allows for use without a common wire. * Intuitive adjustment for precise comfort control, easy to use touch screen display and extra large backlit display with natural language * Menu Driven programming guides the user through the programming process only showing necessary information and choices on each screen * Thermostat operating message feature sends a message containing the status of the HVAC equipment