RECHARGEABLE & ADJUSTABLE LED LIGHT: Our headband magnifier with 4 led lights has the function of detachable and adjusting the direction of illumination. When using, you can adjust the illumination direction of led for more precise illuminating angle to meet your need. Also, you can remove the battery to charge. It takes 1.5 hours to fully charge through Type-C USB cable. Fully-charged battery can make LED light last continuously for 6-7 hours. HIGH QUALITY LENSES: Come with 4 replaceable lens at 1.5X, 2X, 2.5X, 3.5X maginification, which are made of shatterproof crystal clear magnifying acrylic lens designed, high definition, light weight.1.5X maginification at 333mm focal length, 2.0X maginification at 250mm focal length, 2.5X maginification at 200mm focal length, and 3.5X maginification at 142mm focal length. Different Magnification to meet different needs. Our headband magnifier can provide a specific magnification power (X), the viewing ability is depended on the distance from the object you adjust. DETACHABLE LENS DESIGN: Handsfree headband magnifying glass is designed with detachable lens and you can put the optical lens you need on it with the 2pcs plastic screws to fix it. Very easy to change the different lens to meet your different needs. The illuminated headband magnifier can be tilted up and down as needed, and moved out of the way when no longer required. Also, You can wear this head magnifier visor over your own prescription glasses or safety goggles. COMFORTABLE&ADJUSTABLE HEADBAND MAGNIFIER: The inner side of the headband is wrapped with soft PU Leather, which makes the head more comfortable and not easy to flip off when worn. Head magnifying glasses with 3 knobs. You can use the sides 2 knobs to adjust the height / angle of the lens, and the another one knob on the back side can adjust to fit the head size.