The Super Sprouter ® Digital Heat Mat Thermostat is easy to use. Simply plug the heat mat into the thermostat and place the temperature probe in desired location. The temperature control range is 68 ° F - 108 ° F (20 ° C - 42 ° C). Temperature is easily viewed through the back lit digital display, allowing you to accurately set ideal germinating or rooting temperatures. Maximum current rating is 8.3 amps/1000 watts. The Super Sprouter ® Digital Heat Mat Thermostat comes with a one year warranty. ETL listed.