Honeywell Thermostat, 750 mV, 20 to 30 V, 50/60 Hz Frequency, Programmability: 7 days Programmable, Changeover: Auto, Manual, Battery, Hardwired Power Source, Up to 2 Heat/2 Cool Conventional, Up to 2 Heat/1 Cool Heat Pump Stages, Switch Position: Heat-Off-Cool-Auto-Emergency Heat (System), Auto-On-Circ (Fan), Thermistor Sensing Element, Touch Screen Display, +/-1 deg F Differential, 40 to 90 deg F Heat, 50 to 99 deg F Cool Settings, 5 to 90% Non-Condensing Humidity, Horizontal Mounting, Cool Current: 1 A, Terminal Designation: C, G, L, R, RC, S1, S2, W (O/B), W2 (AUX), Y, Y2/E, Fan Current: 0.6 A, Heat Current: 1 A, Premier White, Dimensions: 3-3/4 in H x 6 in W x 1-3/8 in D