Use the Heated Germination Station to increase your germination rate and allow your plants to get a healthier start. The indoor greenhouse provides gentle warmth for fastest growth with included heat mat. Systems Includes: UL Listed Waterproof Heat Mat (17 Watts, 120Volts) 2 Inch Tall Humidity Dome 11 Inch x 22 Inch Watertight Base Tray 72 Cell Seedling Insert Instructions with Growing Tips.