M-4 Round 4" Inch lighted magnifier with 3x main lens and 5x bifocal. (Available with or without bifocal lens) Wide field of view makes this an ideal reading and inspection and scanning magnifier, illumination assists with low light conditions and increased contrast. This is also useful for those with early to mid stage AMD Macular Degeneration. Uses/requires two "C" batteries. *We recommend only using high quality batteries such as Duracell, Energizer, etc. Made in USA