Jump Start,CK64050 Germination Station w/UL Listed Heat Mat, Tray, 72-Cell Pack, and 2" Dome UL-listed waterproof heat mat, 17 Watts, 120 Volt, 8.875" x 19.5" 2" humidity dome 11" x 22" watertight base tray 72-cell seedling insert Includes instructions with growing tips The Station's vented plastic top means better humidity control