Head Magnifier Rechargeable Magnifying Glasses LED with 5pcs Eyeglass for Reading Repair Item Type: Head Magnifier Product Model: MG81000NC Product Material: ABS plastic and 6pcs acrylic optical lenses. Lens Magnification: 1.0X, 1.5X, 2.0X, 2.5X, 3.5X Lens Focal Length: Approx. 142 ~ 500mm / 5.59 ~ 19.69in, please refer to the instructions for each multiple focal length. Power Supply Model: USB charging, supporting up to 24 hours of continuous operation. Lighting source: 8 LED lamps. The lamp is dual color with cold light and warm light, and 3 different lighting modes of cold light, warm light, and mixed cold and warm light. Battery: 1 x 803040 polymer lithium battery with a capacity of 900mAh, shipped with a built in battery.