The 2100-C Standard Flashhead does not contain any controls to ratio the power or the modeling light. It comes equipped with a 1000 watt second flash tube (color corrected to 5500'K), 100 watt tungsten modeling lamp, 15' power cord, and a mounting bracket with knobs for securing the bracket to a light stand and attaching an umbrella. This bracket also has a universal adaptor base which allows it to a standard 5/8'' stud (with an optional accessory 4041 adaptor it can also mount to a smaller 3/8'' tube/stud).