Widely used in mechanical processing, electronic repair, jewelry appraisal, timepiece repair and miniature engraving, etc." Jeweler watch repair magnifying glasses. LED light source and battery compartment designed separately In order to see the object well, the higher the magnifying lens used, the closer it needs to be the distance from the use Hands-free glasses legs and headband are interchangeable to ensure more comfortable and tight wearing Double Left & Right Eye Flaps Magnifying Glass / Loupe with Adjustable LED. Eye flaps can be moved left and right. Objective magnification: 10X, 15X, 20X, 25X Color: Black Material: ABS + Optical Lens The package includes: 1 x LED magnifying glasses, 1 x headband, 4 x pairs of lenses Please note this is a jeweler watch repair magnifying glasses, could not be used as total presbyopia glasses and cannot act on macular disease.