Features: The adjustable speed controller unlocks 38km/h top speed for scooters through secure software optimization, featuring double speed modes (20km/h default & 38km/h upgrade) for customized riding experiences. Crafted with plastic housing, this plug and play scooter speed controller modifies firmware settings via preset modes while maintaining compatibility for seamless integration. Designed for electric scooter owners and enthusiasts seeking performances upgrades in private environments, requiring technical awareness of motor specifications (250W/350W+) for optimal speed adjustments. Ideal for controlled private roads, closed campuses, or recreational areas where riders can safely explore enhanced acceleration capabilities beyond factory limitations. This scooter speed controller strictly operates as an aftermarket electric scooter upgrade, prioritizing user responsibility for regional regulations and hardware compatibility checks before activation. Specifications: Component: plastic Length:Approx.151mm/5.94inch For Luck 4U Technical parameters: Support multi-speed speed adjustment Package Includes: 1pcs Electric Scooter Speed Adjustment Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.