Item Type: Headband Magnifier Material: ABS, Acrylic Optical Lens Model: MG82000MC Magnification: 1X, 1.5X, 2X, 2.5X, 3.5X, 8X (31 kinds, 23 kinds without repetition) Lens Focal Length: Approx. 35-500mm/1.4-19.7in (please refer to the user manual for each multiple focal length) Power Supply Model: USB charging type (support soft light for 5 hours and strong light for 2.5 hours) Lighting Source: 3 LED lights (white) Battery: 1 x 602030 polymer lithium battery, capacity 300mAh (built in) Feature: 1. 3 LED lights are located at the front of the headband to ensure uniform lighting in a large area, the lighting angle can be freely adjusted. 2. The brightness of LED lamp can be switched between strong light and soft light to meet different lighting requirements, thus protecting vision. 3. The independent adjustment switch at the back of the headband can easily adjust the tightness of the headband and fix it. The headband is made of environment friendly materials, which is comfortable to wear, convenient for sweating and prolonging the use time. 4. Large size headband angle adjustment wheel, can adjust the angle when wearing. The anti skid design makes adjustment easier. 5. It adopts a separate lens design. If only one lens is used (when the focal length becomes longer, the magnification becomes smaller), the other lens can be folded up. 6. The two lenses have different magnification, namely 1.5X and 2.0X respectively. Use the front lens (1.5X) to see ordinary objects, and turn up the rear lens. Use the rear lens (2.0X) to view small objects, and turn up 1.5X front lens. When the magnification is insufficient, two lenses can be used at the same time to achieve a magnification of 3.5X. 7. The rear lens can be replaced. The product comes with 5 replaceable lenses, 1.0X, 1.5X, 2.0X, 2.5X and 3.5X respectively. If necessary, replace the rear lens with a lens of different magnification, and use a small auxiliary lens to switch various magnification between the auxiliary lens and the front lens.The magnification can achieve 14X.