The Super Sprouter Seedling 2-Tray Heat Mat allows you to place two propagation trays end to end for more efficient use of your growing space (a standard 4' fluorescent light fixture fits perfectly over this area). Using only 60 watts, it gently warms root areas approximately 10-20˚F over ambient temperature to improve the germination and rooting process. Heavy-duty construction makes this mat very durable. More than 20% larger than competitive mats to allow even warming of the entire root areas in standard 10" x 20" trays. More consistent heating with fewer hot spots than other seedling heat mats. A built in extension socket allows you to daisy chain up to 10 mats, using only ONE cord and outlet.