Aube by Honeywell TH110-SP-P/U Electric Heating 7-Day Programmable Thermostat May be connected to an electric heating system such as an electric baseboard, a radiant ceiling, a floor heating system, an electric convector, etc. It is not compatible with a central heating system 4000-Watt 240-Volt 16.7-Ampere resistive 60-Hertz 4-wires and SPST Battery-free backup means no re-programming your schedule after power outage Contact relay switching action Dimensions (height by width by depth): 5.1-Inch by 3-Inch by 1.6-Inch