Single stage heat & cool programmable thermostat 5/2 day made of a variety of high quality materials for effective filtering and long lasting durability. For use with all heat pump systems including fossil fuel furnace applications. 24v digital programmable thermostats provide 5 day/2 day programmable settings, digital accuracy and energy savings without requiring decorating touch-ups. Low-profile design covers footprint of most common mechanical thermostats used today. Provides battery backup. Compatible with white-rogers heating and cooling systems. Includes 2 “aaa” batteries. Easy to install. Must be installed by a licensed contractor. Color finish is white . Size is 5-1/8″ w x 1-1/8″ d x 3-3/4″ h . “