Outlet thermostat provides programmable features for most space heater and window air conditioning units, pre-programmed: 4 periods per day, temporary override and manual hold, selectable fahrenheit/celsius setting, adjustable temperature swing (differential), separate programs for heat/cool, easy to read display for time and temperature, easy to use, etl approved, 120v outlet power: includes 2-1.5v g13 alkaline button cell batteries for clock. for use on: electronically controlled 120v/15amp/60hz window air-condition units with auto- restart of cooling.