**Personal Mobility Vehicles (PMV)** are those that have **one or more wheels** and are designed to be used by a single person. A common example of a PMV is the **electric scooter**, which operates with an electric motor and can reach speeds between 6 and 25 kilometers per hour.

Additionally, PMVs include vehicles like **electric unicycles**, which also have a single wheel. These vehicles are subject to certain traffic restrictions, such as the prohibition of traveling on sidewalks, pedestrian areas, tunnels, crossings, highways, expressways, and roads outside urban areas.

Therefore, the main characteristic that defines a PMV is that it is a **vehicle with one or more wheels**, which makes the first option the correct one.