Honeywell TB8220U1003 Visionpro 8000 Programmable Thermostat Unit requires a C-WIRE to work Large, clear display with backlight shows the current and set temperature and time even in the dark Menu-driven programming make setup effortless Touch screen interaction real-time clock keeps time during power failures and automatically updates to daylight savings Armchair programming allows you to remove the thermostat from the wall for programming