Rechargeable Headband MagnifierHigh efficiency rechargeable battery,use 300mAh rechargeable lithium battery.USB power cord can be fully charged after 1 hour and can work for 8 hours,which greatly extends the working time of the LED.Just plug the USB cable into the magnifying glass, and then plug the other end into the slot of the USB power supply to automatically charge.Interchangeable Lens The headband magnifier provides 4 interchangeable lenses1.5X, 2.5X, 3.5X, 5X,which can meet your different needs.It is recommended to choose a lens barrel with appropriate magnification according to the size of the object to be observed. The magnification can be quickly interchanged and placed in the corresponding lens storage box to keep it tidy.Adjustable Brightness Level The USB magnifying glass have two white LED lights,which have two brightness levels, soft light and strong light.That can provide super light and light up the detail surface. Press the switch on the glasses frame, low;once more, switches to bright.One more and the lights turn off.Comfortable And Easy To Use Hands free magnifying glass equipped with ergonomic spectacle frame,comfortable to wear, and has a fixed magnifying glass in front of your eyes.The attached headband can effectively prevent falling, so it is easier to work for a long time.You can also free your hands and focus on the object you want to observe.Versatile Applications The head-mounted magnifier with light has a wide range of usability, which is very suitable for close work, such as reading, watch/circuit repair, crafts, jewelry identification, eyelash extension, welding, painting, etc. It is very suitable to help watch repairers, jewelers, the elderly, short-sighted or short-sighted people observe nearby objects.