Convenient to use: Glasses type function when you don't use the magnifying function the cover can turn over freely; Eyepiece with LED source and it can adjust left and right angle; Excellent performance: 20X magnification cover opening: 3.5cm; Lens diameter: 1.5cm; With highlight LED lamp; Built-in 4 x CR1620 button cells; Price is very cheap The glasses type 20X magnifier is very convenient to use traditional clock magnifiers which need to be clamped by eyelid and may affect the repair quality of precision instruments and clocks. The specifically designed magnifier can solve this problem to make it easier and more accurate to repair precision instruments and clocks. - Color: Black - Material: ABS + optical glass lens + stainless steel support - Double layer lens - Effective diameter: 18mm - Magnification: 20X - Double white light LED - Built-in 2 x CR1620 batteries (with switch)