Flexible Programming: 5-2 day or one week programming. Large backlit display shows current room temperature and set point temperature simultaneously. Smart Response technology learns heating/cooling cycle times to deliver the right temperature when needed. Auto change from heat to cool. Real-time clock automatically adjusts for Daylight Savings Time. Program is retained in memory in the event of a power outage. 12 or 24-hour time display. Fahrenheit or Celsius temperature display. Short cycle protection. Compatible with 24-volt heating and air conditioning systems: single stage, multistage heating and cooling, furnace, central air conditioning, heat pump with and without auxiliary heat, hot water, steam or gravity, 750 millivolt, 24V gas fireplace, 120-240V electric baseboard heat. Includes UWP Mounting System, mounting hardware and quick install guide. Requires 2AA batteries.