More than 650 police and security agencies worldwide are using Segway products to patrol airports, downtown areas, transit stations, manufacturing facilities, shopping malls, and campuses. Because it only has two wheels and uses a gyroscope that senses body movement to steer and to balance the rider, the Segway is very maneuverable. The Segway PT is currently available in two police models. Both the i2 Police and x2 Police can travel at up to 12.5 mph and run on rechargeable batteries. Batteries can be recharged by utilizing any 90- to 260-volt and 50- to 60-Hz AC outlet.