The M11 can handle a multitude of lighting situations, in the studio or on location. Features a system of quick-release, bayonet mount reflectors, from 7" to 22". In all, there are over 50 Speedotron accessories that allow the M11s to produce the exact quality and amount of light needed, and deliver it to the specific location, with a color corrected flashtube. A power supply for this flash head is required.