Wolo’s 8104 XL series emergency strobe light kits are designed for extended length vehicles, providing reliability and high performance. There are 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” 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. The power supply has a heavy-duty aluminum-mounting bracket that secures with four screws, provided. There are six (6) advanced flash patterns to choose from, which are controlled with the touch of a button from the control panel provided. The 8104 series is the perfect choice for most extended length fire/rescue, police, ambulances or construction vehicles that require powerful hidden warning lights that will vastly increase visibility, so to be seen. Kit included: 80-watt power supply, two (2) blue and two (2) red strobe bulbs with 6” wire leads an locking connector, four (4) extended length high voltage cables with locking connectors, switch control panel, mounting hardware and easy to follow instructions in English / Spanish