1. Up to 23 magnifications: Exclusive design with 2 lens slots and a fixed round lens (8X). The two lens slots can accommodate either one or two lenses at a time (1X, 1st 5X, 2X, 2.5X, and 3.5X). Combining 3 lenses provides 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. 2. Comfortable to wear: Simply turn the rear knob to adjust the headband for different head sizes. Two knobs on the left and right sides allow you to adjust the height of the magnifying glass body as needed. Soft and breathable sponge lining enhances wearing comfort. 3. Adjustable lighting angle: In addition to adjusting the entire lighting frame, the lighting unit can be rotated up and down after being positioned on the frame for more precise lighting angles. Equipped with 3 LEDs as a light source, offering brightness and long service life. 4. Rechargeable battery: This LED head magnifier features a builtin battery that lasts 812 hours after a full charge, eliminating tangled cables during use. Its lightweight and compact design ensures portability, allowing you to take it anywhere and use it conveniently.