The B1 XL. Binocular Adapter is hands-down the lightest and most convenient digi-scoping system on the market today. Comprised of a B1 Adapter ring that fits around your binoc's eyepiece along with a thin stainless steel plate that adheres to your phone, it's an incredibly simple system that delivers surprisingly terrific image and video. Best of all, it does NOT impede normal use of your binoculars, making it incredibly practical too. Creates the ultimate lightweight digi-scoping platform for capturing photo and video on your phone through your binoculars B1 Adapter seamlessly integrates with your binoculars Fits eyepieces from 44mm-48mm (1.73-1.89") Includes super-thin stainless steel plate that adheres to your phone to secure the phone to the optic PLEASE NOTE: Phone Plate will interfere with wireless chargers. Order today!