PRO1® Programmable Thermostat, 18 to 30 VAC, 50/60 Hz Frequency, Programmability: 5/1/1 day Program, Battery, Hardwired Power Source, 2, 3 Heat/2 Cool Stages, Switch Position: HEAT-OFF-COOL-EMERGENCY (System), AUTO-ON (Fan), 4 sq-in LCD Display, 0.2 to 2 deg F Differential, 41 to 95 deg F Settings, 32 to 105 deg F, 90% Non-Condensing Humidity, +/-1 deg F Accuracy, Wall, Junction Box Mounting, Terminal Designation: RH, RC, C, Y, Y2, W/E, W2 G, O, B, White, Dimensions: 4.4 in H x 4.7 in W x 1.1 in D