Honeywell Thermostat, VisionPRO® 8000 Series, 18 to 30 VAC, 750 mV, 50/60 Hz Frequency, Programmability: 7 days Program or Non-Programmable, Changeover: Auto, Manual, Dual Powered Battery, Hardwired Power Source, Upto 2 Heat/2 Cool Conventional Systems, Upto 3 Heat/2 Cool Heat Pump Stages, Switch Position: Heat-Off-Cool-Auto-EM Heat (System), Auto-On-Circ-Follow Schedule (Fan), 10 sq-in Touchscreen Display, 40 to 90 deg F Heating, 50 to 99 deg F Cooling Settings, 32 to 120 deg F, 5 to 90% RH Non-Condensing Humidity, Horizontal Mounting, Terminal Designation: R, RC, C, W (O/B), W2 (AUX/E), Y, Y2, G, A-L/A, K, U1 U1, S1 S1, Electrical Connection: Screw Terminal, Arctic White, Dimensions: 4-5/8 in H x 4-15/16 in W x 1-1/8 in D