ADJUSTABLE LED LIGHTS: The angles of the LED lights can be freely adjusted to ensure a large lighting area. The brightness of the LED lights can be switched between strong and soft light using the black button to protect your eyesight. COMFORTABLE TO WEAR: You can adjust the switch on the back of the headband to a suitable size for wearing. Two knobs on both sides can adjust the height of the magnifying glass to meet your desired viewing angle. Lightweight materials and soft, breathable sponge inside ensure comfort during work. COMBINED LENS CASE DESIGN: Designed with two lens cases and a fixed front round lens (8X). You can place one or two lenses at a time in the cases. Five interchangeable lenses (1.0x, 1.5x, 2.0x, 2.5x, 3.5x) and the extra round lens (8x) can be combined to achieve 23 types 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, 14x. RECHARGEABLE BATTERY: Charge the battery when the LED brightness decreases. It takes four hours to fully charge via USB cable. You can charge via a USB charger, computer, power bank, etc. WIDE APPLICATION: The hands-free multi-power combined lens magnifications can meet your requirements for various uses: reading, painting, observation, modeling, repair, sewing, soldering, jewelry making, and other hobbies/crafts.