1-day programmable, auto-changeover FlatStat thermostat2-stage heating and 2-stage coolingFor use with gas/electric, heat pump with aux, and electric systemsBi-color LED: red for heat, green for coolInstalls flush with the wall1-day programmable, auto-changeover FlatStat thermostat. 2-stage heating and 2-stage cooling. For use with gas/electric, heat pump with aux, and electric systems. Bi-color LED: red for heat, green for cool. Installs flush with the wall. Dimensions: 2.7W x .37D x 4.3H in..