9.9x5.4cm/4.0x2.1in Foldable design pocket sizelightweight to carry with. 3X magnification for indoor viewing, Specially suitable for theaters and horserace. adjust by Smooth "center-focus knob" and right ,easy on for focus even for . Beautiful design and durability . materials used and tested extensively. Not a professional lens. It is more ornamental compared with the practicality. It is a perfect Birthday Holidays for her.