zoom, through its wholly-owned holding-company subsidiaries, gold lion holding limited (“gold lion”) is the owner of 51.03% of tianjin tong guang group digital communication co., ltd., company organized under the laws of the people's republic of china (“tcb digital”) and 100% of profit harvest corporation ltd., a company organized under the laws of hong kong (“profit harvest”). the business of zoom is the businesses of gold lion, which is comprised of the businesses of tcb digital, jiangsu leimone electronics co., ltd. (“jiangsu leimone”) and profit harvest. profit harvest serves as sales and marketing arm of tcb digital, and as such, substantially all of the business of zoom is generated by the business of tcb digital. both tcb digital and jiangsu leimone are in the business of manufacturing, research and development, and sales of electronic components for 3rd generation mobile phones, wireless communication circuitry, gps equipment, and related software products.tcb digital is a high technology enterprise engaging in electronic and telecommunication product design, development, and manufacturing capability and process. tcb digital started its business in 1999 and was originally set up as an electronic manufacturing service (ems) factory for mobile phone vendors. tcb digital was motorola's first independent outsourcing manufacturing vendor responsible for producing motorola mobile phones in china. moreover, tcb digital was the first ems factory in china receiving motorola's international quality product and qualification certificate. currently tcb digital is headquartered in tianjin, china. tcb digital has two main business operations, one providing electronic manufacturing service for oem (original equipment manufacturer) customers and the other designing and producing mobile phone products.tcb digital offers high quality and comprehensive ems to both domestic and global customers including samsung, tianyu, cct, palm, danaher, spreadtrum and sk telecom. major products manufactured by tcb digital include mobile phones, wireless telecommunication modules, digital cameras, cable tv set-up boxes, and gps equipment. in addition, tcb digital develops various state-of-art feature mobile phones and smart-phones based on td-scdma, gsm, wcdma and cdma technologies. tcb digital markets its mobile phone products through channel distributors in china and also supplies customized mobile phones to china telecom, one of the major mobile operators in china.