A. The speed control handle of this electric vehicle is model F30F40. It is a thumb sensor speed control handle in scooter accessories and can also be used as an accelerator or throttle to achieve starting and speed control functions. B. It has a well - designed thumb sensor speed control structure, which can bring users a convenient and efficient speed control experience in actual operation. Whether the scooter needs to accelerate quickly during the journey or adjust the speed smoothly, it can handle it easily to meet diverse riding needs. C. It is widely applicable to regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and is popular among consumers in different regions. D. Such design and performance can add more fun and convenience to the use of the scooter and is a good choice to enhance the scooter riding experience.