USB rechargeable LED lamp head-mounted reading glasses magnifying glass with 5 multiples AZ10521 Features:1. The illuminated magnifying glass is equipped with a USB charging cable.2. There are 5 interchangeable lenses3. The magnifying glass legs on the head can be switched to an elastic headband, which is more comfortable to wear. You can wear your own glasses on the magnifying glass.Suitable occasions: suitable for the elderly, amateurs and professionals. Suitable for close work, such as dentists, electricians, jewelers, sewing, handicrafts, beauty and painting.Specifications: Material: ABS, acrylic optical lens, metal accessoriesProduct size: about 21.5 * 15 * 18.5cm / 8.46 * 5.90 * 7.28in (after assembly)Magnification: 1 times, 1.5 times, 2 times, 2.5 times, 3.5 timesLens focal length: 500mm, 330mm, 250mm, 220mm, 140mmLens: about 95 * 33 mm / 3.74 * 1.3 inches