[Safe and durable]: made of high quality ABS material, not easy to deform and damage, very durable and reusable. With a silicone pad on the surface that connects the phone to the eyepiece to protect the phone and lens of the optical device. [Compact and easy to carry]: the machine telescopic adapter holder is small and easy to carry, can be put in a backpack when going out, does not take up space and can be used at any time. [Compatible smartphone]: universal adapter holder for mobile phones with a width of 66 mm to 95 mm and a depth of 6.5 mm to 14 mm. [Convenient installation]: simply stretch the phone holder and insert the telescopic phone holder into your phone to install it, save time and hands. [Widely used]: The mobile phone telescope adapter can be mounted on most binoculars, spotting scopes, telescopes and spotting scopes as well as microscopes due to our universal design.