15.The outer lens is detachable to be used alone or with the 8X magnifying glass as you needFlexible adjustable design - The retractable temple support can be adjusted to the right length to fit most heads.You can adjust the angleof the lens barrel and LED lights, and the brightness of the LED light is also adjustable. Perfect repair tools - Suitable for searching, watch and mobile phone repair, jewelry appreciation, identificationantiques, reviewing design drawings, field trips, etc. Please note: The focal length of this magnifying glass is not adjustable. Observe the object according to the actual situation, and the clearer themost suitable viewing distance. This may not work for people with AMB (macular degeneration) and others with severe vision loss Material - This adjustable double eye magnifying glass is made of high quality plastic, imported acrylic optical lens, easy to use. Head magnifiers with 2 LED lights operate on 3 AAA batteries (batteries are not included) Available up to 3 types of magnifications - 8X, 15X and 23X. The inner lens has a magnification of 8 while the extended outer lens has a magnification of