An electric unicycle is a motorised self-balancing unicycle that has a motor and battery that'll propel you along by leaning your body.
Similar to a Hoverboard, the Electric Scooter works with gyroscopes and hardware that detects which way you're leaning. This controls the acceleration, braking, and turning. They usually have powerful motors, with some able to reach speeds of up to 50 Km.
They're small and light compared to an electric scooter or bike. Becoming a favourite of extreme riders everywhere!