INTERCHANGEABLE CLARITY LENSES: Upgraded headband magnifying glasses provide higher magnification 1.5X, 2.5X, 3.5X, 5X. The lenses are interchangeable depending on the magnification you need. Made of superior material, acrylic optical lenses are durable, water-resistant, and scratch-resistant. RECHARGEABLE USB INTERFACE DESIGN: Compared to heavy magnifiers powered by 3A batteries, this head-mounted magnifier has an obvious advantage - lightweight. You don't have to worry about long-term wearing. Multiple USB power sources: wall charger, mobile phone/laptop charger, or power bank (not included). You will be surprised by fast full charging and longer use time. ADJUSTABLE BRIGHTNESS LEVELS: Magnifying glass with LED light also has two brightness levels. You can easily turn the light on or off via a switch. Press once, low; once more, switches to bright. Once more and the lights turn off. Magnifying glass with light provides sufficient brightness in any dark or dim environment to illuminate the surface of the viewed object accurately. Saves money and energy while enjoying the long-lasting bright light. COMFORTABLE HEADBAND TO WEAR: Equipped with elastic band, anti-slip design, and frees your head stress. Ergonomic frame with soft forehead padding, hands-free magnifiers are suitable for long-term eye work. You don't need to adjust the light's position, brightness, lens when moving to another place. Even so, it's better that you rest your eyes to soothe tired eyes.