A. This bicycle speed control handle is a good accessory for electric-assisted mountain bikes and scooters. It is exquisitely designed, with specifications of 65*43*29 mm and a weight of only 0.05 (unit not mentioned). It is light and compact, not adding extra burden. B. It features a thumb-operated design, which is very convenient to operate and can achieve the speed control function, just like equipping the vehicle with a sensitive "throttle". The use of Hall sensors makes the speed control more accurate and stable, bringing a smooth speed adjustment experience for cycling. C. It is quite popular in regions such as Europe, South America, Southeast Asia, North America, Northeast Asia and the Middle East. D. In addition, it has an authorized self-owned brand, which ensures a certain level of quality and adds more fun and convenience to your cycling life.