Introducing the BLUE Easy Reader Thermostat - a thermostat that is easier to read, easier to use, and easier to understand. So simple it can be operated at a glance. Research has shown that many consumers, including the 78 million baby boomers in the United States, have expressed a clear preference for easy-to-operate, easy-to-read thermostats. The large characters (1" high numerals) and one-button, one-function operation make it simple to set or adjust. And the lighted 6-inch display makes it even easier to operate in low light areas. One-touch mode buttons to set the temperature or selectable 7-day program (installer selectable). Patented pre-programmed schedule simplifies time and temperature programming. Meets ENERGY STAR specifications. Choice of battery-powered with optional power stealing assist or hardwired with battery backup. Selectable Energy Management Recovery. Meets California Building Code, Title 24. Permanent program retention during power loss. Indefinite set point hold or temporary temperature override. Furnace filter change reminder. Maintains room temperature to within +/-1° F. Room temperature display can be re-calibrated up to +/-4° F. Temperature Range: 45-90 F. Energy-saving selectable 7-day programmable feature automatically adjusts the temperature to different times of the day. Additionally, according to the Department of Energy, you can save up to 30% on your heating and cooling costs when the thermostat is used in the programmable mode. These savings can average up to $250 per year.