The USBfever UF002471 190deg. Fish Eye lens is portable and detachable, you can take photo with your iPhone 4G at any time. It comes with a Back Cover, whenever you need to take photo with Fisheye, just screw on the Fisheye Lens on, then you can take 190deg. Fisheye picture with your iPhone 4G. The back cover is suitable for the wide angle lens for iPhone 4, macro lens for iPhone 4 and 8X telephoto lens for iPhone 4 too.