The "fiber optic cable socket" is equipped with Olympus waterproof protectors, and the "L-type rubber bush" can be bundled up to 2 optical cables. Key features of the product; By using this product, you can attach the "fiber optic cable socket" to the "L shape" on the protector side. When you install a wide conversion lens, the optical cable will roll up to the front of the lens to greatly reduce the chance that it came into the images you take.