The FO2 fiber optic cable is designed to connect an Intova PX-21 strobe with our X2 and HD2 cameras. The specially designed diffuser plate attaches to the strobe by replacing the existing clear plate on the PX21's diffuser holder. When attached, it aligns the optical cable to aim the light signal into the strobe's trigger sensor while the custom adapter on the other end of the cable fits securely over the built-in LED light on the X2 and HD2 camera. The fiber optic cable comes with handy hex wrench to adjust each end of the cable's tips to ensure proper clearance.