Electric motorcycles and scooters are plug-in electric vehicles with two or three wheels. The electricity is stored on board in a rechargeable battery, which drives one or more electric motors. Electric scooters (as distinct from motorcycles) have a step-through frame. Electric vehicles are far quieter than gasoline powered ones, so silent they may sneak up on unwary pedestrians. Some are equipped to emit artificial noise. http://www.isooyuelectricbike.com/electric-motorcycle/