Wolo (8004-6CCRR) Lightning 80 Watt Power Supply Four Bulb Emergency Warning Strobe Kit - 2 Clear Bulbs, 2 Red Bulbs 2 Clear bulbs and 2 Red bulbs Designed for reliability and high performance, with four (4) grommet style strobe bulbs that are encapsulated in silicon for moisture protection and to protect against road vibration The bulbs easily install into a 1 inch hole, which is drilled into each headlight and taillight assembly The power supply, 8004-PS is heavy-duty, with an operating voltage of 12-24 VDC and has four outlets producing 80-watts of output power Engineered with a state-of-the-art field proven microprocessor, to provide years of dependable service