Could you please recommend your product that can prevent sun ray reflection from the window?

If you are talking about the exterior reflection that can melt siding and burn grass, you have a couple options. If you need to still see through the glass, many people have had success with our black screen film reducing the issue : https://www.decorativefilm.com/sx-c390-black-screen If the view does not matter, then you can go with any of the exterior rated frosted films. All the films need to be installed on the exterior, as a reminder!