Zone Panel, 4-IN-1, TrueZone®, 2 Heat Stages, 2 Cool Stages, Temperature Setting: -40 to 165 Deg F, Terminal Designation: Three Of M1,M4,M6,R,C,W1/E,W2,Y1,Y2,G,O/B,L One Of RH,RC,W1/E,W2,Y1,Y2,G,O,B,DS/BK,R,C,DATS,DATS, LED Display, 24VAC Power Source, 18 to 30VAC Voltage Rating, Wall Mount, Gray, 11-1/2 inch Height, 8 inch Width, 2 inch Depth, Standards: FCC Class B, For Use With: THM4000R1000 Wireless Adapter, Programmable and Non-programmable Thermostats , 50/60 Hz Frequency, Humidity Range: 5% to 90% RH Non-Condensing