The Master 4 by LTL Controls is the safest and easiest way to control a 4 HID light setup. This controller has the capability to run a maximum of (4) 1000W ballasts using 120V power & 240v power, with a maximum relay amperage of 30 amps, and includes a 120V trigger cable which can be connected to a 120V timing device. It is recommended to consult a certified electrician before installing or using this controller, especially if you are unfamiliar with electrical wiring and circuits. (120v & 240v Universal Plug)