This is a no-brand modular lens compatible with GoPro 9/10/11/12. It provides a 155-degree wide-angle view when attached in front of the lens after removing the protective glass. It was only mounted once after being purchased new and has never been actually used. Please consider this before purchasing. Photos have been added. They compare the lens with and without the mod lens attached. The angle of view can be changed on the GoPro itself during actual shooting. I also confirmed that the video stabilization function works correctly with the mod lens attached. Although I'm an amateur, I didn't notice any significant difference in image quality or functionality compared to the genuine product.