Ediors 120W 4 HID Bulbs Hide-A-Way Emergency Hazard Warning Strobe Lights 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, with an operating voltage of 12-24 VDC and has four outlets producing 120 watts of output power Engineered with a state-of-the-art field proven microprocessor, to provide years of dependable service Selectable flash pattern with a press of a button. Brighter and more effective than standard LED strobe lights