Permanent electric bicycles are electric cars under permanent brand names, whose main product bicycles were the first domestically sold for four consecutive years in 2002-2005, with sales exceeding $1 billion annually. With regard to electric bicycles, 300,000 units/years of production have been permanently created and have three major product groups. These products are sold not only domestically, but also in over 100 countries and territories. In product design, permanent electric bicycles focus on comfort and durability. For example, a number of styles have been designed with a 9-heavy pole and a light-quantified multi-barrel frame, which, in combination with a double-depression, has allowed a significant reduction in the back and back of the car and provided a more smooth ride experience. At the same time, they are equipped with high-performance car cores, with strong and stable output, increased range and constant power and speed, more than twice as high as normal batteries. Per...