PRO1® Thermostat, T800 Series, 18 to 30 VAC, 1 to 1.5 A, 50/60 Hz Frequency, Programmability: 5-1-1, 7 day Program, Changeover: Auto, Battery, Hardwired Power Source, 1 Heat/1 Cool Stages, 8 sq-in Blue Backlit Display, 0.2 to 2 deg F Adjustable Heating and Cooling Differential, 44 to 90 deg F Settings, 32 to 105 deg F Ambient, 90% Non-Condensing Humidity, +/-1 deg F Accuracy, Horizontal/Junction Box Mounting, Terminal Designation: RH, RC, C, Y, W, G, B, O, (2) AA Alkaline Battery, Dimensions: 4.6 in H x 4.7 in W x 1.1 in D