ADJUSTABLE LED LIGHTS: The angles of LED light can be regulated freely to ensure a large lighting area. The brightness of LED lights can be switched between strong light and soft light by the black button to protect the eyesightCOMFORTABLE TO WEAR: You can adjust the switch at the back of the headband to a proper size to wear. Two knobs on both sides can adjust the height of the magnifier to meet your request view angle. Lightweight material and soft breathable sponge inside will make you will feel comfortable when operating.COMBINED LENS SLOT DESIGN: Designed with two lens slots and one fixed front round lens(8X). You can put one or two lenses at a time on the slots. Five replaceable lenses (1.0x, 1.5x, 2.0x, 2.5x, 3.5x) and the round auxiliary lens (8x) can be combined to get 23 kinds of magnification: 1x, 1.5x, 2x, 2.5x, 3x, 3.5x, 4x, 4.5x, 5x, 5.5x, 6x, 8x, 9x, 9.5x, 10x, 10.5x, 11x, 11.5x, 12x, 12.5x, 13x, 13.5x, 14xRECHARGEABLE BATTERY: You need to charge the battery when the LED brightness loss. It takes four hours to fully charge through USB cable. You can charge through a USB charger, computer, power bank, etc.WIDELY APPLICATION: The hands-free multi-power combined lens magnifications can meet your requirement for different use: reading, painting, observing, modeling, repairing, sewing, soldering, jewelry making, and other hobbies/crafts