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. Includes UWP Mounting System, mounting hardware and quick install guide. Requires 2AA batteries.