1、Powered by 3pcs AA batetry (not included), designed with 3 LED light sources, the lighting area is large and uniform, with two levels of brightness adjustment of strong light and soft light, to meet different lighting needs, and has the effect of eye sight protection. Independent lens design, if need to use one lens (the focal length becomes longer, the magnification becomes smaller), the unused lens can be folded up. 2、The two main lenses are of different multiples, 5x and x respectively. If you only need to use the front lens (5x) to observe general objects, you can turn the rear lens up and fold it up. If you need to observe small objects, you can use 0x rear lens and turn the front lens 5x up. You can use two lenses at the same time to achieve 5x magnification effect. 3、The rear lens is replaceable, with 4 replaceable lenses, respectively 0x, 5x, 0x and 5x, which can be replaced with different magnification lenses, can be matched with small secondary lens and front lens for a variety of magnification switch, up to 13X. 4、Equipped with lens storage box, the unused lens can be placed in the box, easy to keep the lens clean, and easy to carry. Widened lens, the middle and lower part of the lens has a U?shaped gaps, which can make the lens and the eye closer, increase the field of eye sight, close observation and reading more easily. 5、An independent adjusting wheel at the back of the headband can easily adjust the tightness and fixation of the headband, making it comfortable to wear. With angle adjustment wheel, it can be adjusted when wearing.