PRO1® Non-Programmable Thermostat, 24 VAC, 3 Stages, Relay Switch, 4 sq-in LCD Display, 2 Switches, 0.2 to 2 deg F Differential, 32 to 105 deg F Ambient, 90% Non-Condensing Humidity, +/-1 deg F Accuracy, Battery, Hardwired Power Source, Wall, Junction Box Mounting, Dimensions: 4.4 in H x 4.7 in W x 1.1 in D, Red