The CARSONIB700, patented HookUpz Smartphone Binocular Adapter easily connects your smartphone to your full-sized, 32mm to 50mm binoculars. It comes included with two interchangeable rubber rings that allow the adapter to fit full-sized binoculars that have an outer eyepiece housing diameter between 40mm-44mm. Once you determine which ring works best, press firmly for a tight hold to the eyepiece. The adapter is adjustable to fit all popular smartphones on the market, including Apple, Samsung, HTC, LG and more! In most cases there is no need to remove your phone's case.