Summary: No.9 electric C is a light city intelligent commuting tool for young consumers, with light size and bright and beautiful body color, showing the vitality of young people. Objective: the key has always been an essential part of the electric vehicle, but it is inconvenient to carry, easy to lose, complex to operate, forget to lock the car and so on. Therefore, we hope to develop a new system to completely solve the above problems. Background: with the continuous progress and development of science and technology, human society has begun to enter the era of Internet intelligence, smart home, smart car, etc. have gradually entered thousands of households, more and more people enjoy the convenience brought by science and technology. In contrast, China has become the world's largest electric two wheel vehicle manufacturing and use, and electric vehicles have also become the general trend to replace oil power. However, China's domestic two wheel vehicle market is still in an early state, with similar products and weak innovation, which has greatly constrained the development of the industry. Around the world, the traditional two wheeled vehicle enterprises are the same as the traditional automobile enterprises. The product focus is still on the fuel vehicles. For the automobile industry, the appearance of Tesla is slowly affecting the development of the industry. Based on the advantages brought by electric vehicles, it has become a new idea to define the products from experience. Starting from the two wheel balanced car, Segway-Ninebot has a strong electric based technology development ability, and has core competitiveness that competitors in the same industry in China do not have. Simplifying the movement of people and things with technology has always been the company's goal and mission. Series C is a city commuter E-bike tailored for young people based on this goal.