PocketWizard makes the radio triggers I use to wirelessly fire my flashes and sometimes my cameras. This image of a professional ATV racer used their radios to fire a flash on the inside of the turn, I was on the outside. He made 4 runs for this shot, I am using a really wide lens so he is MUCH closer than he looks. I got buried in his roost every time, I was still washing dirt out of my hair days later. So worth it for this shot!