resideo Low Voltage Thermostat, 20/30 VAC, 50/60 Hz Frequency, Changeover: Manual, 2 Stages, Switch Position: Heat-Off-Cool System, Auto-On Fan, Precision Snap Action Switch, Analog Display, 45 to 95 deg F Settings, 0 to 120 deg F, 5 to 90 % Humidity, Hardwired Connection, Cool Current: 0.02 to 1 A, +/-2 deg F Accuracy, Heat Current: 0.02 to 1 A, Dimensions: 4-3/4 in H x 2-7/8 in W x 1-3/8 in D, Premier White, For Use With: 1 Heat/1 Cool Conventional Systems and Heat Pumps with No Auxiliary Heat