Zone Control Panel, 3-Port, TrueZone®, 2 Heat Stages, 1 Cool Stages, Temperature Setting: -40 to 165 Deg F, Terminal Designation: R, C, E/Aux, Y, G, O, B, DS/BK, L, DATS, LED Display, 24VAC Power Source, 18 to 30VAC Voltage Rating, Wall Mount, 8-1/8 inch Height, 8 inch Width, 1-55/64 inch Depth, Standards: FCC Class B, For Use With: Programmable, Non-Programmable Thermostats and Dampers, 50/60 Hz Frequency, Humidity Range: 5% to 90% RH Non-Condensing