The USBfever UFAC001991 180 degree 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 180deg. Fisheye picture with your iPhone 4G. The back cover is suitable for the Wide Angle Lens for iPhone 4G, Macro Lens for iPhone 4G and 8X Telephoto Lens for iPhone 4G too. It is made up of high-class glass and op-grade aluminum.