Quantum Thinking Limited, an investment holding company, provides system development, technical consultation, hardware-related, and short messaging services in the People's Republic of China. It operates through Services; Sales of Hardware segments; and Short Messaging Service Fee segments. The company offers develops and establishes integrated online platforms for the distribution of mobile products, as well as online network systems; manufactures and trades in hardware products; develops technical and software products related to identity authentication services; and constructs a unified payment system and platform. It also provides software products; financing, payroll, and administrative services; and training and consultancy services on robotic process automation. The company was formerly known as Yunbo Digital Synergy Group Limited and changed its name to Quantum Thinking Limited in December 2017. The company was incorporated in 2000 and is headquartered in Wan Chai, Hong Kong. Quantum Thinking Limited is a subsidiary of Happy On Holdings Limited.