Specifications:Material: ABS, Metal, Optical Glass LensColor: Black+Silver+ClearMagnification: 20XIllumination Source: 6 x LED LightPower Supply: 3 x LR927 Battery (included)Size: (L)X(W)X(H) 52x36x25mm /2.05"x1.42"x0.98"(appr.) Features:● High quality multifunctional magnifier with a coated achromatic lens composed of two components and three elements.● Surrounding lens are evenly distributed wit 6 lighting chip LEDs, which ensures the objects to be viewed can be clearly displayed in the dark, without shadow phenomena, with similar effect of medical shadow less lamp.● For printing industry, thread counter, linen tester. Operation Instructions:Put the object to be viewed under the barrel-type magnifier, then rotate aluminum alloy lens frame left and right until clear image is obtained.Turn on power switch in case of insufficient illumination. Replacement of Batteries:1.The arrow on the sign of the battery cover counterclockwise rotation, alignment semi circular mark battery compartment, open the battery cover2.From the battery compartment remove the battery LR927, replace the battery3.The arrow on the sign of the battery cover, the clockwise rotation to the triangle mark battery compartment, close the battery cover. Package Included:1 x LED Magnifier1 x English User Manual