Hydrofarm 7.5 Inch Dome Jump Start CK64060 Hot House with Heat Mat, Tray, 72 Cell Insert, 7.5 7" dome for growing bigger and taller starts Increases germination success Better humidity control for optimum growth 17 watts, 120 volt 11" x 22" watertight base tray 72-cell seedling insert Instructions with growing tips Seedling Heat Mat is UL Listed