Low Voltage Thermostat, Terminal Designations RH, W, System Switching Heat-Off, Fan Switching No, Automatic Changeover No, Dual Transformer Compatible No, Power Method Hardwired, Voltage 20 to 30V AC, 750mV Compatible Yes, Mounting Vertical, Height 4 1/2 in, Width 3 1/4 in, Depth 1 5/8 in, Color White, Control Range 50 Degrees to 90 Degrees F, Features Mercury Free, For Use With Millivolt, Includes F92-0563 Kit, Switched Subbase, Standards NEC Class II. This item has been restricted from sale in the following state (s): []