Keen Ocean International Holding Limited is an investment holding company that designs, develops, manufactures, and sells transformers, switching mode power supplies, electronic components, and electric healthcare products. It operates in Hong Kong, China, Europe, the United States, India, and internationally. The company offers toroidal and EI transformers, steel core products, inductors for EV chargers, inverters, PCB assemblies, power amplifiers, inductors, switching mode power supplies, and C type core products, and is also involved in trading electronic parts and components. Its transformers and power supply products are sold under the Keen Ocean brand, serving manufacturers, trading entities, and the healthcare, industrial, audio and communications, power supplies, and elevators industries. Founded in 2000, it is headquartered in Tsuen Wan, Hong Kong.