Resideo TH1320U4002 Low Voltage Thermostat, Heat and Cool, Auto and Manual, Auto On Circulate, Horizontal J5450XL External Thread Size 3 4 in External Thread Size 3 4 in measuring 17 1 2 in x 28 5 8 in x 10 5 8 in inside Mounting Hardware Hardwired Number of Relay Outputs 3 Millivolt Compatible Yes Contact Rating 24 V AC Number of Heating Stages Heat Pump System 3 Maximum Control Temperature 99 Degrees F Number of Relay Inputs 3 Dehumidification Control No Temperature Scale Fahrenheit Celsius Standards UL Listed Battery Type (2)AA Batteries Amperage 1 A Temporary Temperature Hold No Maximum Operating Temperature 120 Degrees F Filter Change Reminder Yes Humidification Control No Minimum Operating Temperature 32 Degrees F Backlit Screen Color Blue Temperature Differential + 1 Degrees F Minimum Control Temperature 50 Degrees F Fan Settings Auto On Circulate Control Type Push Button Frequency 60 Hz Product Type Low Voltage Thermostat Application Heat and Cool System Settings Auto Heat Cool Off Number of Zones 1 Mounting Direction Horizontal Number of Cooling Stages Conventional System 2 Maximum Operating Humidity 90 % Changeover Type Automatic and Manual Programming Capability Not Programmable Temperature Sensitivity 3 to 3 Degrees F Display Type Digital Backlit Type Always On Operating Temperature Range 32 Degrees to 120 Degrees F Includes Positive Off Yes Differential Type Adjustable Temporary Program Override No Minimum Operating Humidity 5 % Includes AA Batteries