Solid, Inc. engages in the manufacture and sale of wired and wireless telecommunication equipment. Its products include a distributed antenna system, interference cancellation system, cloud radio access network, wideband code division, multiple access, and long-term evolution. It focuses on locations requiring high-density mobile communication networks, such as hospitals, stadiums, performance halls, universities and office spaces, international airports, and subways in major cities. The company was founded on November 5, 1998 and is headquartered in Seongnam-si, South Korea.