Honeywell Home Thermostat, Series: Pro 3000, Digital, Non-Programmable Thermostat, Relay Switch, R, Y, AUX, E, G, O/B, L, C Terminal Designations, Heat/Cool/Off System Switching, Auto/On Fan Switching, Thermistor Sensor, 2 Stage, 5 to 90 % Humidity, 1.32 sq-in Display, 20 to 30 VAC, Horizontal Mounting, Premier White , 5-3/8 in W x 1-1/4 in D x 3-13/16 in H, Import,