This is an electronic thermostat which is more accurate than an analog thermostat. By simply pressing the single "Mode" button, the heater can be operated in any of its modes. The first press will turn the heater on and it will operate in the last active mode. With each press of the button, the mode will change as indicated by the lit LEDs. The modes include low or high manual (the heater will constantly run) or low and high automatic (the heater will operate to maintain the set temperature displayed by the LED). The set temperatures include 60, 65, 70, 75 or 80 degrees Fahrenheit. The heater is turned off by either holding the button down for two seconds or continually pressing the button until the "Off" mode is reached.