Z-wave touchscreen programmable thermostat offers top-of-the-line features like touchscreen interaction, real-time clock, and large, easy-to-read backlit display. UN 3091 lithium metal batteries packed in/with equipment. YTH8320ZW1007 includes TH8320ZW1000 thermostat plus THP9045A1023 wire saver module. Z-Wave delivered messages allows thermostat to be added to or removed from Z-Wave controller. Wire saver allows use without 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 user through programming process only showing necessary information and choices on each screen. Thermostat operating feature sends message containing status of HVAC equipment. Universal programming from seven-day to non-programmable. Auto or manual changeover.