Honeywell VisionPRO® Universal Thermostat, Series: 8000, Programmable Thermostat, 40 to 90 deg F Heat/50 to 99 deg F Cool Control, R, RC, C, W (O/B), Y, G, S1, S2 Terminal Designations, Heat/Cool/Auto/Off System Switching, Auto/On/Circulate Fan Switching, 2 Stage, 1 Stages Heat, 1 Stages Cool, 5 to 90% Non-Condensing Humidity, 10 sq-in Back-Lit Display, 20 to 30 VAC, Battery/Hardwired Power Source, Horizontal Mounting, Premier White®, 6 in W x 1-1/4 in D x 4-9/16 in H