Honeywell Thermostat, Series: Pro 3000, Digital, Non-Programmable Thermostat, Relay Switch, R, RC, W, Y, G, O/B, C Terminal Designations, Heat/Cool/Off System Switching, Auto/On Fan Switching, Thermistor Sensor, 1 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