Experiment with different lighting options and create dynamic lighting effects using the OC-E4A cord. Bringing you great flexibility for macro and studio flash, it lets you connect products with a Canon multi-function shoe to an external Speedlite or microphone and still retain complete control of all settings. The cable powers accessories direct from the camera, so external devices such as microphones can be used with no additional power source needed. And for extra flexibility, its dust and water resistant, with a locking lever mechanism at the base of the unit so it can be securely and safely connected to your camera and work in all weather conditions.