Focus digital manual heat or cool thermostat. Large backlit digital display. Accurate temperature control of +/-1 deg. F. for consistent comfort. Set point is retained in memory in the event of a power outage. Easy-to-operate, soft touch keys. Auto change from heating to cooling to provide maximum comfort. Requires 2 "AAA" batteries. Easy installation. For use in most 24V heating and air conditioning systems. Not for use in electric baseboard, heat pump with auxiliary heat, or multistage heating and cooling systems. Approximately 4.5" W. x 3" H. x 1" D. Off white.