Incorporated in 1981 as Sterling Electronics, the company was renamed Sterling Computers in 1989 and later to Essar Teleholdings Ltd is promoted by C Sivasankaran, the company manufactures personal computer systems at Perungudi, Tamilnadu, where it has a modern assembly line as well as state-of-the-art testing equipment with an installed capacity of 18,000 pa. Sterling Cellular, a subsidiary, was granted a licence to operate cellular mobile telephone services in Delhi. Aircel Digilink India, another subsidiary, also offers the same services. The company commenced manufacturing and marketing computers under the brand name Siva and also offered technical services for word processors and related systems. Besides computer systems, fax modem cards, laser printers, plotters, VGA colour monitors, multimedia, the Pentium series and note-book computers, the company also deals in hi-tech exercise equipments like precision electronic treadmills, pro-form cross walks and exercycles. The company's products are exported to Australia, the US and Europe. In 1991-92, the company diversified into printing and publishing telephone directories with yellow pages for major cities.