Cazul Goods Seedling Heat Mat for Hydroponics, Waterproof Heating Pad 10" x 20.75" Use it for faster vegetable, herb, and flower seed growth It has a strong heating wire and thick multi-layer construction for heavy-duty use. It warms the root area for 10-20F over ambient temperature to improve germination It's water-proof construction is keeps out moisture for optimal safety It has a 6-foot power cord, and will work on 100-120V