Special engine parts (electronic control unit), special engine parts (anti-theft device), dual-fuel engine management system (electronic control unit), dual-fuel vehicle conversion device equipment, engine cylinder gasket, engine overhaul kit, R&D, production and sales of auto parts, motorcycle parts, mechanical parts; vehicle gas cylinder installation; self-operated and agent import and export business of various commodities and technologies (except for commodities and technologies that are restricted by the state or prohibited from import and export).