Honeywell Thermostat, Series: T1 Pro, Non-Programmable Thermostat, 32 to 102 deg F Control, 1 deg F Differential, Relay Switch, R, RC, C, W, O/B, Y, G Terminal Designations, Heat/Cool/Off System Switching, Auto/On Fan Switching, 1 Stage, Up to 1 Stage Heat, Up to 1 Stage Cool, 5 to 90% RH Non-Condensing Humidity, Small Display/Soft Key Control Display, 20 to 30 VAC, 0.02 to 1 A Heat/Cool Running Full Load, Battery/Hardwired Power Source, UWP Mounting, White, 4-1/16 in W x 1-3/32 in D x 4-1/16 in H