Use this thermostat with your Seedling Heat Mat to maintain just the right temperature for the seeds you're starting or the cuttings you're rooting. Easy to use - simply plug your heat mat into the thermostat, place the temperature probe into your soil, and set the dial to the desired temperature. The thermostat will turn the mat on and off so soil temperature remains constant. 6-ft. power cord and 6-ft. cord to heat mat. 4-1/2"l x 3-1/4"w x 1-1/2"h