- Versatile Compatibility: This smartphone adapter holder fits eyepieces with an outer diameter of 28mm-47mm, making it ideal for use with binoculars, monoculars, telescopes, birdwatching binoculars, and microscope eyepieces. - Broad Smartphone Fit: Designed to accommodate a wide range of smartphones, the universal mobile phone adapter has an adjustable width of 54mm-90mm, ensuring compatibility with over 98% of phone models on the market. - Perfect for Outdoor Enthusiasts: Whether you’re birdwatching, observing wildlife, enjoying floral views, whale watching, stargazing, or capturing stunning photographs, this cell phone adapter mount enhances your outdoor experience by allowing you to document and share your adventures. - User-Friendly Design: The phone and eyepiece surfaces are lined with soft EVA material to protect your equipment from scratches and damage while providing a stable connection. A tripod can easily be attached to the screw port of the phone adapter for added stability. - Durable and Reliable: Built to withstand various outdoor conditions, this adapter ensures that you can enjoy your activities without worrying about equipment wear and tear. This smartphone adapter holder is an essential accessory for anyone looking to elevate their outdoor viewing and photography experiences.