The 3M Filtrete 7-Day Touch Screen Programmable Thermostat offers 4 program periods per day for your comfort and convenience. It has a beautiful, bright back-lit display that is easy to read. It has a near universal HVAC system compatibility including heat pumps (with auxiliary), 1 or 2 stage furnaces, and 1 or 2 stage compressors. A handy holiday program allows for a completely separate one-day program. The thermostat includes low-battery and filter-change indicators.