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The Segway PT is a two-wheeled self-balancing personal transporter which uses computers, sensors, and electric motors to keep the device upright. The rider commands the PT to go forward or backward by shifting their weight forward or backward on the platform. The maximum speed of the Segway PT is with a range of on a fully charged lithium-ion battery, depending on terrain, riding style, and the condition of the batteries. Invented by Dean Kamen, it is produced by Segway Inc.