Interchangeable Clarity Lenses: Upgraded headband magnifier glasses offer higher magnification 1.5x, 2.5x, 3.5x, 5x. The lenses are interchangeable depending on the magnification you need. Made of premium material, acrylic optical lenses are durable, water-resistant and scratch-resistant. Rechargeable USB Interface: Compared to heavy magnifiers powered by 3A batteries, this head magnifier has an obvious advantage: light. You don't need to worry about the extended wearing. Multiple USB power sources: wall charger, cell phone/laptop charger or power bank (not included). You will be amazed with a fast full charge and longer use time. Adjustable Brightness Levels: The magnifier with LED light also has two brightness levels. You can easily turn the light on or off via a switch. Press once, bass; once more pass the light. One more and the lights go out. Magnifier with light provides enough brightness in any dim or dim environment to accurately irradiate the surface of the viewed object. Save money and energy while enjoying the long lasting bright light. Comfortable Headband to Wear: Equipped with elastic strap, non-slip design and free your head from stress. Ergonomically framed with soft padding on the forehead, the hands-free magnifier glasses are suitable for long time eye work. You don't need to readjust the light position, brightness, lens when you move to another place. Even so, you better have an eye rest to smooth out tired eyes. Works well on close-up projects: As an extremely handy accessory, the headband magnifier is effective for close-up work , such as reading, sewing, painting, model making, welding, repairing, hobbies, crafts, inspection, jewelry making, etc. Can be applied to all precision programs that need to enlarge small objects.