9 LED, Polycarbonate Clear Lens 30 Flash Patterns, Multiple Heads can be Sychronized, Mounting can be Vertical or Horizontal, Self-contained and Sealed Control Module - No Need for a Separate Flasher Module, Mounts in a 1" Hole (same size hole as a strobe tube), Universal Fit for All Vehicles, 15' Cable, Maintenance Free, Easy Installation. Sold as individual units.