The SF C1 works with radio frequencies in the 2.4-GHz band and offers up to eight separate channels for the configuration of flash units in groups. The flash units, which may be at distances of up to 100 meters from the SF C1 mounted on the camera, can be controlled as a single group or split into up to three separately controlled groups. For instance, you can separately control the output of a single flash unit with a beauty dish, a spotlight, and further units for lightening shadows and illuminating the background.