Single Eye Observation - CAN NOT use it with both of your eyes (when you working ), because focal distance from lens to product is 0.2-2in (0.5-5cm). 2 Adjustable LED Light - can help work in low-light conditions (Button batteries Included). Rotate the LED switch cover about 30 clockwise from the dot to lamplight mark to turn on the light. 8 Interchangeable Magnification - 2.5X 4X 6X 8X 10X 15X 20X 25X magnifications can be interchanged easily and put in corresponding lens storage box. Bonus: A cleaning cloth are included to remove dust, dirt & fingerprints to enhance the view for the small parts. Interchangeable Bracket and Headband - The interchangeable design ,change the bracket into the headband when need to wear for a long time,prevent the drop off.It is more easy to work for a long time. Multiple Usage - Various lens for mechanical processing, beauty & makeup, jewelry appraisal, clock repair and miniature engraving, Gift Idea, etc. Product Description Read more