MET safety certified; Ensures the root area of seedlings remains between 70℉and 85℉ to ensure growth and increased germination Designing with waterproof construction, our seeding heat mat is safe for use indoor plantings,The new, stronger heating wire and thicker multi-layer construction offer more uniform heating and the durability to withstand rugged greenhouse environments. safer and more durable, and guarantee the stability of seedling mat safety work.