IMPORTANT: The fixture(s) you plug into the digital controller MUST have a grounded plug end, because the digital controller has 2 receptacles which will accept up to 2 plug end cords. If your fixture does not have a grounded plug/cord you may be able to add one to it (please consult a licensed electrical contractor) and most home centers offer a grounded plug/cord commonly known as a "pig-tail"(See above picture of pigtail) in 3' or 6' lenghts with a ground prong.