This truly portable lamp with magnifier comes with a USB rechargeable battery. The brightness remains consistent for the full eight hours. The LEDs circle the magnification lens for uniform lighting over your project. Offering five diopters (2.25X) magnification with a 12 diopters (4.0) inset lens for working on the finest details. This lamp will work up to eight hours with a full charge. The battery will last four hours on full brightness. There is a battery level indicator. Folds flat when not in use. Comes with a two year warranty. This package contains one rechargeable magnifier light. Imported.