Rechargeable Lens material Acrylic 3.5 x magnification power About this item 5 lenses Interchangeable: There are 1.0X, 1.5X, 2.0X, 2.5X and 3.5X magnification lenses can be chosen for different crafts. High clarity acrylic optical lenses with good magnification in sturdy case with lens holder, space-saving and protective. Lightweight and easy to assemble: This magnifying headset is USB charging, reduce the load on the head and is more comfortable to use. The assembly and disassembly of the lenses is very easy; the lenses can be adjusted over 90 degrees and can be flipped up very easily when not in use. Adjustable and flexible lens slot: move the magnifying lens slot to adjust the distance between your eyes and the lens to meet different needs, ensuring precise illumination of the light source on the object surface. Plus, the interchangeable headband makes it useful for those who wear glasses. Adjustable LED lights: The hands-free reading magnifiers feature two energy-saving, ultra-bright LED lights. The lights can be adjusted by pressing the power switch on the light. Versatile applications: free your hands while performing tasks such as eyelash extensions sewing, dressmaking, knitting, cross stitch, embroidery (1X to 2.5X) or close work such as soldering, coins, stamps, jeweller's loupe, modelling, watch repair, crafts, hair extensions eyelashes, manicures, etc. (3.5X)