adjust by Smooth "center-focus knob" and right eye lens , for focus even for kids. Foldable design, mini pocket size, to carry with. 3X magnification for indoor viewing, Specially suitable for theaters and horserace. Beautiful design and durability built to last. quality materials used and tested extensively. Not a professional optical lens. It is more ornamental compared with the practicality. It is a perfect Birthday Holidays gift for her.