Contact us feel free if you have any questions, qa will try our best to help you solve problems. thanks Features: Left and right double eye patches magnifier with LED 8 different magnifications can be interchanged quickly Bracket and headband is interchangeable to each other It can be used in mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving etc. Easy to use and change lens 38 cm headband with elasticity Resin lens plastic frame Specifications: Type: Magnifier Color: Black Magnification:2.5X times ,4X times ,6X times,8X times,10X times,15X times,20X times,25X times Package weight: 0.165 kg Product size (L x W x H): 19.00 x 14.00 x 6.00 cm 7.48 x 5.51 x 2.36 inches Package size (L x W x H): 15.00 x 12.20 x 6.00 cm 5.91 x 4.80 x 2.36 inches Compatible with: Adventure,Home use Material: Glasses,Plastic Power By: LR1130 Battery LED Quantity: 2 Package Included: 1 x Magnifier 16 x Change Lens 1 x Headband 1 x User Manual? Widely used: can be used Compatible with machining, electronic maintenance, jewelry identification, watch repair and micro engraving, etc. ? Humanized design: 38 cm elastic headband Compatible with easy head wear and easier work. ?High quality: Made of ABS plastic and optical lens, long service life, good effect and wide detection range. ?LED light: with adjustable LED light, this left and right eye patch loupe magnifier can help you work in low light. ?Replaceable lens: Includes 8 pairs of different magnification (2.5X, 4X, 6X, 8X, 10X, 15X, 20X, 25X) lenses to meet different needs.