INTERCHANGEABLE CLARITY LENSES: Upgraded headband magnifier glasses provide higher magnification 1.5X, 2.5X, 3.5X, 5X. The lens are interchangeable according to the magnification you need. Made of superior material, acrylic optical lenses are durable, water-resistant and scratch-proof.RECHARGEABLE USB INTERFACE DESIGN: Compared with heavy magnifying glasses powered by 3A batteries, this head mount magnifier glass has an obvious advantage-lightweight. You dont need to worry about long-time wearing. Multiple USB power source: wall charger, cell phone/laptop charger or power bank(not included). You will be surprised by quick full charge and longer use time.ADJUSTABLE BRIGHTNESS LEVELS: Magnifier with LED light also has two brightness levels. You can easily turn on or off the light via a switch. Press once, low; once more, switches to bright. One more and the lights turn off. Magnifying glass with light provides sufficient brightness in any dark or dim environment in order to irradiate the surface of the viewed object accurately. Saving money and energy while you enjoy the long lasting bright light.COMFORTABLE HEADBAND TO WEAR: Equipped with the elastic strap, anti-slip design and releasing your head stress. Ergonomic frame with soft forehead padding, hands free magnifying glasses are suitable for long-time eye working. You neednt to readjust the position of the light, the brightness, the lens when you move to another place. Even though this, you have better have an eye rest to smooth tired eyes.