Keep your home at the perfect temperature 7 days a week with this Emerson thermostat. The easy-to-read digital display with backlight option allows you to adjust the thermostat in any lighting. The 5/1/1 day programmable thermostat system works with most single stage heating and cooling systems, and heat pump systems without aux. And in case of power failure, your program settings are remembered and restored when the power comes back on. Not compatible with electric baseboard heat and some other systems.