Emerson 4.5 in. Display, Single Stage (1H/1C) With Program Choices: 7 Day, 5+1+1 Day Or Non-Programmable Digital Thermostat; Backlit Display, 24-Volt or Millivolt, System Switch-Heat, Off, Cool, Fan Switch-Auto, On, Keypad Lockout, Temperature Limits, Profile-Horizontal, Dual Power: Hardwire And/or Battery, Range 45-99°F. Terminals- RH,RC,C,W,Y,G,O/B. *Not compatible with electric baseboard heat and some other systems.