This probably reminds you of an electric bike, so you may be confused regarding why are electric bikes legal although not scooters? Perfectly, electric scooters can achieve higher speeds of around 30km/hour, even so the battery needs being recharged just after a certain distance (between ten and forty miles). https://waylonyoese.isblog.net/rumored-buzz-on-electric-mobility-scooters-for-adults-47221673