From the Manufacturer
Universal 5/2 Programmable Thermostat with Large Backlit Display; Conventional push button programming; Retains memory in event of power outage; Smart Response Technology; Easy Access Battery Compartment; 12 or 24 Hour Clock; Celsius or Fahrenheit Temperature Display; Compatible with Single or Multi Stage Heating and Cooling, Heat Only, Cool Only, Furnace(Warm Air), Central Air Conditioning, Heat Pump without aux heat, heat Pump with aux heat, hot Water, Steam or Gravity, 750 Mill volt, Gas Fireplaces.
Honeywell 5-2-Day Electronic Programmable Thermostat. One program for the weekdays; a separate program for Saturday and Sunday - (Up to 4 periods per day). Energy Savings - Program to save up to 33% on annual heating and cooling costs. Easy to Use - Straighforward display and buttons keep operation and programming simple. Backlit Display - Easy to read, even in dimly lit rooms and hallways. Smart Response Technology - Continually adjust the pre-heating/cooling of your home so you are comfortable at your programmed times. Compatible with heating and cooling plus heat pumps. Does not work with electric baseboard heat (120-240V). Precise temp. control (+/- 1F). Easy access battery compartment. Soft touch keys.