The HLC-1e is used as a high temperature shutdown by plugging your lights into the outlet and setting the maximum temperature that your growing environment can sustain. If this setting is exceeded, your lights will turn off. This is cheap insurance for your garden. The HLC-1e can also be used as a heating thermostat. Connect your heating equipment to the heating outlet, and then set the temperature that you wish to maintain. If the temperature falls below your setting, the heating outlet is activated. Comes with a 3' remote temperature sensor. Rated for 15 amps@120 volts. 3 year warranty.