Oi Electric Co., Ltd. engages in the design, development, manufacture and sale of information transmission equipment; monitoring and control devices; telecommunications network equipment; mobile communication devices; and measuring instruments. It operates through Telecommunications Equipment Manufacture and Sale segment and Network Construction and Maintenance segment. The Telecommunications Equipment Manufacture and Sale segment offers optical transmission system, security and surveillance system, remote measurement and sensing system, and wireless application system-related equipment. It also engages in the manufacture, sale, and contracting of software of said equipment. The Network Construction and Maintenance segment engages in the construction and maintenance of communications equipment, optical network, and cable televisions. The company was founded on January 7, 1950 and is headquartered in Yokohama, Japan.