Hydrofarm CK64061 11-by-22-Inch Hot House Plus with 72 Seed-Starting Coco Plugs The Hydrofarm Hot House Plus grows healthier starts, increases germination success, and has better humidity control for optimum growth Includes Jump Start 81 pellet grenhouse to eliminate the fuss and mess of dirt The 7" humidity dome makes it perfect for starting cuttings Includes waterproof heat mat, humidity dome, 11 by 22 inch watertight base tray, 72 cell seedling inserts, and a seed-starting-booster UL listed waterproof heat mat, 17 watts, 120 volt