It seems this is used by attaching it to a camera! It protects the camera from scratches and does not interfere with basic functions. *・゜We have special offers in our profile*・゜ ⭐Instant purchase welcome・Midnight silent purchase OK◎ ⭐Free shipping ✱No shipping on weekends and holidays Shipping is only on weekdays. If you purchase on Friday, it will be shipped on Monday or later (* ᴗˬᴗ) #NAE's list of products✨☜ It enhances the expandability of the camera and allows you to attach various external accessories for shooting. The frame says "For RS2 / RS3 Series". Are these the compatible models...? We have measured and listed the size, so please be sure to check if it fits your camera before purchasing!! I have no knowledge of cameras, so I'm waiting for those who do to purchase (,,ᴗ  ̫ᴗ,,) 20-1 99.38