This is a top-of-the-line thermostat. It features a large blue backlit touch screen display with every day individually programmable.The occupant can temporarily override any setting if a particular day differs from the programmed set-up. The LCD displays set points, time, and room temperature. Unlike most set-backs that turn on at a set time, this model computes time needed to warm or cool the house to the set temperature and turns on at the calculated hour. As a special feature, the thermostat can be set to cycle the fan when the furnace isn’t in use to exhaust indoor air. Service reminders can be programmed in for filter or humidifier pad replacementSpecifications20 to 30VACHardwire or batterySize: 5 9/16″ W x 4 3/5″ H x 1 1/5″ DColor: WhiteManufacturers part # 1F97-1277Features• Energy Star Rated• 7day or 5 + 1 +1 day programming• Includes programmable furnace fan control• Can be used for gas, electric, hot water, steam heat, or single-stage heat pump.• Set point range 45 degrees F to 99 degrees F.