Halo GO Magnifying Lamp This fully portable magnifying lamp comes with a USB rechargeable battery. The LEDs surround the magnifier above your project for consistent lighting. The brightness will not diminish during use, whether plugged in or on the go. 5 diopters (2.25x) with an additional built-in 12 diopter lens (4.0x) allow for magnification to work on the smallest details. Technical specifications: • USB rechargeable battery • Up to 8 hours of constant and sustained brightness • Battery level indicator • 5 diopter lens (2.25X) with additional built-in 12 diopter lens (4.0X) • Folds flat