resideo Vertical Programmable Thermostat, PRO 2000 Series, 750 mV, 20 to 30 V, 50/60 Hz Frequency, Programmability: 5-2 days Programmable, Dual Powered Battery, Hardwired Power Source, 1 Heat/1 Cool Stages, Switch Position: Heat-Off-Cool (System), Auto-On (Fan), 40 to 90 deg F Heat, 50 to 99 deg F Cool Settings, 5 to 90% RH Non-Condensing Humidity, Vertical Mounting, Cool Current: 0.02 to 1 A, Terminal Designation: B, C, G, O, R, RC, W, Y, Heat Current: 0.02 to 1 A, Cycles per Hour: 2 to 6 CPH Heating, 2 to 6 CPH Cooling, Premier White, Dimensions: 4-11/16 in H x 2-7/8 in W x 1-1/8 in D