Made of material, acrylic lenses, more durable and anti scratchPortable and convenient, eyeglasses legs according to their own needs to adjust the length more comfortable and tight wearing.You can adjust the led brightness according to demandPerfect for mechanical processing, jewelry appraisal, clock repair and miniature engraving, etc.Material: ABS, acrylic optical lens, metalMaterial: ABS, acrylic optical lens, metalMagnification: 8X 15X 23X (1 pair lens are 8X magnification,another lens are 15x magnification, it will be 23x magnification if you use it together).Lens focal length: 62mm 33mm 21mmBattery: 6*LR1130 (not included)Lighting source: 2*LED lightWeight: 71G (net weight), 97G (including packaging)Product size: 175*155*55mm (unfolded), 155*85*55mm (folded)Packing size: 160*73*52mm