Product Features: 【 Upgrade 】: Diecast Aluminum Housing & Ultra-thin design.24 LED as light source, offers a super bright light output, can be seen on a bright clear day. 【 High Performance 】: Integrated heatsink, and anti-condensation drain port, Waterproof and dust-proof, and corrosion-resistant. 【 18 Strobe Patterns 】: Built-in flasher, 18 select-able flashing patterns; Last pattern recall/memory function. 【 Universal 12V-24V 】: Fits for any public utility vehicles, construction vehicles, tow trucks, snowplows, emergency medical vehicles, ambulances, oversize load vehicles, slow vehicles 【 Easy to Install 】: 3 wires connection:Yellow for Flash Pattern Switch (Touch positive wire to pattern switch), Red for .