2.5x Clamp-On Magnifier Magnifying Glass Lamp White This is a new 5X white, illuminated swing arm magnifier with clamp on base The powerful magnification may help to reduce eye strain The lens measures approximately 4" (102 mm) in diameter It is convenient for your home or office and enlarges fine print in books, maps, newspapers, directories, legal documents, etc. It is ideal for reading assistance in low-light conditions 118-120V 60Hz