ThermostatEasy energy saving buttons (NORM / SAVE) - Easy Mode Switching Buttons (HEAT/OFF/COOL) - Can be used with all 24VAC heating and cooling systems. It cannot be used with line voltage systems. - Is Digital and your desired heat or cool temperatures can easily be set on the large screen with the TEMP UP (+) and TEMP DOWN (-) buttons on the front. - A minimum 4-minute off time protects heating and cooling systems from damage. - Uses a new technique called sequential staging for more comfort with faster reaction to requested temperature changes. - Battery Backup with 2 x "AA" batteries (included)