A. This is an accessory suitable for scooters, carefully designed for the general public. It includes various functional components, such as a speed control handle, a thumb throttle, and brakes. B. In terms of design, this accessory is quite delicate. It measures 70*47*22 millimeters and weighs only 0.021 kilograms. It is small, lightweight, and yet has relatively strong functions. It won't add too much burden to the scooter and can help the scooter maintain good controllability and flexibility. C. It has a wide range of uses. The speed control handle can precisely control the traveling speed of the scooter, allowing riders to easily adjust according to different road conditions and needs. The thumb throttle has a quick response and can provide relatively large power output, enabling the scooter to accelerate more smoothly. The brakes can ensure riding safety and can take effect quickly when it is necessary to slow down or stop, making riding more reassuring. D. This accessory is relatively popular in regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East. It is trusted and liked by many users and is a good choice for improving the performance of scooters.