Premier Series Digital Thermostat, Switchable: Programmable or Non-Programmable, Choose 7-Day, 52 Day or 1-Day Programming, Up to 4 Heat 2 Cool Stage, Gas, Electric or Heat Pump Control, Fault Input, Comfort Recovery, Control to, or Monitor a 2nd Temperature Sensor, Programmable Fan, Set Point Limiting, Bi-Color Led Indicates a Cooling or Heating Demand, Power: 24VAC Return, Made In China