These LED semaphore bulbs have the flashing circuit built right into them. You don't need anything else. No extra wiring, flashers, or modifying your car's electrical system.
We have 6v and 12v bulbs available make sure you are selecting the right voltage before checking out!
SWF semaphores can be done on the car.
SHO semaphores you'll need to remove the lens in order to install the bulb.
Have a look at them in action here