Non-Programmable Push Button Millivolt And Hydronic Zone Valve Compatible Thermostat, 2-Heat/2-Cool Conventional, 3-Heat/2-Cool Heat Pump, Temperature Range: 45°F To 90°F , Power: Hardwired, Battery, Color: White, Applications: Electric, Floor Or Wall Furnaces, Heat Pumps, Systems With Up To 2 Stages Heat, 2 Stages Cool, Gas/Oil Heat, Comfort Alert, Milli-volt, 2 And 3 Wires Hydronic Zone Heats, Dimensions: 4"H X 5-1/9"W X 1-3/10"D