Garden Smart 10" x 20.75" Waterproof Seedling Propagation Starter Heating Pad Seed Germination Starting Heat Mat 10" x 20.75" 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. Fits Grow Pro 10" x 20" trays perfectly.