Compact and Portable: It is 78*150*40mm, and it weighs about 148g. It is very small and easy to carry and store. Eyepiece Holder: The eyepiece holder fits eyepieces with an outer diameter of 26-46 mm and fits most spotting scopes, binoculars and spotting scopes. Phone Holder: The adjustable width of the phone holder is 54-96mm, which is suitable for most smartphones on the market.If your phone with bulky phone case, please take it off in order to ensure the phone fits the clamp well.