Honeywell TH114-A-024T-15S/U Thermostat, Low Voltage, White, Outside Depth: 0.91 IN, Outside Width: 2.76 IN, Amperage Rating: 0.5 AMP, Outside Height: 4.89 IN, Non-Programmable, Setting Temperature: 40 - 86 DEG F, Differential Temperature: 1 DEG F, 0.5 DEG C, 24 VAC, Thermistor Sensor Element, Accuracy: 0.9 DEG F, 0.5 DEG C, 32 - 122 DEG F, Switch Type: External Solid State Relay, Switch Position: AF/F (Switch MUST Be Set To AF For This Thermostat To Be Operational), Terminal Designations: R, C, W, Cycles Per Hour: 240, For Electric Heating, Baseboard Heater, Radiant Ceiling, Convector, Aube RC850/RC850T Series Electromechanical Relays