A. This is a scooter accessory - a thumb - shift speed controller. It is suitable for a variety of scooters and has a wide range of users. It is designed to be small and lightweight, weighing only 42 grams, which is easy to carry and won't add too much burden when installed on a scooter. B. As an accelerator regulator, users can easily adjust the speed with their thumb. It can control the running speed of the scooter more precisely and flexibly to meet different riding needs. Whether you want to glide smoothly and slowly or experience a fast sprint, it can be easily achieved. C. This product is sold in regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and is well - liked by users in various places. D. This is a practical accessory that scooter enthusiasts shouldn't miss.