means an electric personal assistive mobility device, which is a self-balancing device with two wheels not in tandem, designed to transport only one person by an electric propulsion system with an average power of 750 watts (one horsepower), having a maximum speed on a paved level surface of less than 20 mph, when powered solely by such a propulsion system while ridden by an operator weighing 170 pounds.
(Ord. 27292 § 1, 2004-11-16)