9.9x5.4cm/4.0x2.1in, Foldable design, pocket size,lightweight to carry with. adjust by Smooth "center-focus knob" and right eye lens ,easy on for even for kids. 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. 3X magnification for indoor viewing, Specially suitable for theaters and horserace.