Established in 1921, RadioShack Corporation is one of the largest consumer electronics retailers in the United States. Located in Redwood City, Calif., the corporation offers a number of products, such as cell phones, MP3 players, laptops, electronic products and accessories. It also provides radio communication devices, computers, audio/video equipment, batteries and video games. Additionally, the company features a full complement of postpaid rate plans from three national carriers: AT&T, Sprint and T-Mobile. RadioShack Corporation supplies products from several brands, including Gigaware, Thomson Multimedia, RCA, Enercell and Auvio.