The 5-2 Day Programmable Thermostat is easy to use and features a large backlit display, which shows current room temperature and set point temperature simultaneously, user-friendly controls and key features such as Smart Response technology. You can program it to fit your lifestyle week and weekend, plus up to four periods per day. The program is retained in memory in the event of a power outage and a real-time clock automatically adjusts for Daylight Saving Time. Programming adds to your comfort level and subtracts from your energy bill. Smart Response technology learns your heating/cooling cycle times to deliver the right tempature when you want it. 1) Auto change from heat to cool, 2) Includes change reminders for filters and low batteries, 3) Temporary and permanent hold settings, 4) 12 or 24 hour time display, 5) Requires 2 AA batteries (not included), 6) Fahrenheit or Celsius temperature display.