Segway

The Segway is a two-wheeled, self-balancing personal transporter device invented by Dean Kamen and introduced to the market in 2001 as the Segway HT, later known as the Segway PT. The device was initially developed from the self-balancing iBOT wheelchair and was unveiled on Good Morning America in December 2001. The Segway PT had three speed settings and was steered by a twist grip, but was later replaced by the i2 and x2 models in 2006, which featured leaning handlebars and regenerative braking.learn more on wikipedia