Features: -7-day programming with 4 settings per day -Time and temperature can be set differently for each heat and cool setting -Temporary temperature changes are easy by pressing the large up-down arrows -The display can be either Fahrenheit or Celsius -Operation of the thermostat is annoyance free: Autochangeover is standard -Smart recovery - improves comfort by anticipating heating requirements -The display is backlit with large numbers so it's easy to read in dark hallways -Programming is simple because it's self-prompting -Battery-less operation with 72 hour clock backup and a "NeverlostTM" program -Clean filter indicator on the display -Fully electronic means no "droop" for better comfort -Meets Title 24 Residential Requirements in California -5 minute compressor protection is standard -Proven reliability backed by the world's largest manufacturer of air conditioning and heating equipment Dimensions: 7 5/8" W X 4 1/2" H X 1 1/2" D