Ensures the root area of seedlings remains between 70℉and 85℉ to ensure growth and increased germination. Available in 4 sizes: Mini：3.5″x21″, Watt: 7.3W ; Small: 10″x20″, Watt: 17.5W ; Medium: 20″x20″, Watt: 45W ; Large: 48″x20″, Watt: 100W. The Seedfactor Seeding Heat Mat adopts the latest 7.5MM thickening,105 degrees of high temperature resistant cylindrical SJTW 5.9ft water-proof power cord (thicker than the general power cord, solid, high temperature resistant), safer and more durable, and guarantee the stability of seedling mat safety work.