Bisu Technology Group International Limited, formerly Excel Development (Holdings) Limited, is a Hong Kong-based investment holding company principally engaged in the civil engineering and construction businesses. The Company operates through two business segments. The Civil Engineering and Construction segment is engaged in the civil engineering works and building construction and maintenance works. The Automotive Engines segment is engaged in the development, production and sales of automotive engines. The Company is also involved in the leasing of equipment for construction works and the provision of corporate management services through its subsidiaries.