Honeywell Tradeline® Thermostat, Series: 6000, Programmable Thermostat, 40 to 90 deg F Heat/50 to 99 deg F Cool Control, 1 deg F Differential, Relay Switch, RC, R, C, W, W2 - AUX, Y, Y2, O/B, G, K, E, L/A, S, S Terminal Designations, Heat/Cool/Auto/Off/Emergency Heat System Switching, Auto/On/Circulate/Follow Schedule Fan Switching, 4 Stage, 2 Heat Pump, 2 Conventional Stages Heat, 1 Heat Pump, 2 Conventional Stages Cool, 5 to 90% Non-Condensing Humidity, 5.44 sq-in LED Back-Lit Display, 20 to 30 VAC, Battery/Hardwired Power Source, 4-1/16 in L x 4-1/16 in W x 1-3/32 in D, Import