Garden Smart 20" x 20.75" Waterproof Seedling Propagation Starter Heating Pad Seed Germination Starting Heat Mat Garden Smart seedling heat mat warms root area 10 to 20 degrees over ambient temperature. Improve germination process and improve on seedling and cuttings success. Durable construction, waterproof and easy cleaning is is ideal for greenhouses, nurseries, and indoor gardens. Includes a 6 foot 110V power cord. Use with Garden Smart Heat Mat Thermostat for the ultimate germination station.