This all new Radio Trigger is a sophisticated, two part system consisting of a radio sending unit that either fits on the hotshoe of your camera, or plugs into your camera's firing port, and a receiving unit that plugs into the sync port of your main light. This makes triggering your strobes reliably and without yards of sync cords to trip on a pleasure. For proper use of this unit, exposure must be calculated manually, and any special exposure or flash modes must be disabled. For use with strobes only.