With the accessories mounting ring, you can mount up to 3 auxiliary accessories on the Subnado, including but not limited to a GoPro and an underwater fill light, improving visibility and stability for shooting video footage. Tackle your next dive with the Subnado and capture even more stunning footage! Subnado Accessories Mounting Ring Specifications: SIZE: 3.54 *3.14 *1.57 inch WEIGHT: 0.11 lb