With the Mighty Bright Lighted Pendant Magnifier, you can illuminate and magnify anytime and anywhere! It features a 2-inch round optical-grade lens with 3x magnification, a bright white energy-efficient LED that lasts up to 100,000 hours, a neck strap, and an easy-to-use clasp. Powered by three LR44 microcell batteries (included). Measures 3.5" x 0.25" x 2".