Brainhole Technology Limited, formerly Top Dynamic International Holdings Limited, is an investment holding company principally engaged in the manufacture and trading of electronic and electrical parts and components. The Company operates through two segments. Manufacturing segment is engaged in the sales of electronic and electrical parts and components manufactured by the Company. The products manufactured by the Company mainly include diodes, transistors, rectifiers and transient voltage suppressors. Its products are mainly applied in smart consumer electronic devices. Trading segment is engaged in the trading of electronic and electrical parts and components sourced from third party suppliers. The Company operates businesses within the domestic market and to overseas markets, including United States, Europe and Australia.