• Warms root area approximately 12 - 18° F over ambient temperature to improve germination process. • Helps gardeners have better success rates with seedlings & cuttings. • Perfect for one standard 10” x 20” propagation tray. • Heavy-duty construction is much more durable than competitive mats – more than twice as thick! • More consistent heating with fewer hot spots than other seedling heat mats on the market. Specifications: • 10” x 20¾” • 17 watts • 6 foot power cord • Waterproof