HYINDOOR Seedling Heat Mat 20.75"&times;20" Waterproof Hydroponic Heating Pad Can be placed in many different sizes of seedling bowl. Warms root area 10 to 20 degrees over ambient temperature. Dimensions: 20"x 20.75" Watt: 40W Power Cord's Length: 6ft Seedling heat mat for better plant growth and flower seed germination. Increases the success of seedlings and cuttings, durable construction, waterproof and easy cleaning.