Honeywell Home Programmable Thermostat, T6 PRO Series, 20 to 30 V, 50/60 Hz Frequency, Programmability: 5-1-1 days Programmable, 5-2 days Programmable, 7 days Programmable, Manual/Not Programmed, Changeover: Auto, Manual, Battery, Hardwired Power Source, 2 Heat/1 Cool, 2 Heat/2 Cool Stages, Switch Position: Heat-Off Cool, Auto-On, Emergency Heat, Relay Switch, LCD Screen Display, +/-1 deg F Differential, 40 to 90 deg F Heat, 50 to 99 deg F Cool Settings, 37 to 102 deg F, 5 to 90% RH Non-Condensing Humidity, +/-1 deg F Accuracy, UWP System Mounting, Cool Current: 0.02 to 1 A, Alkaline Battery, Fan Current: 0.02 to 0.05 A, AA Battery, Heat Current: 0.02 to 1 A, White, Dimensions: 4.06 in H x 4.06 in W x 1.09 in D