The LiquidRoam RoamBoard ($2,475) is a highly maneuverable electric motorized skateboard, on which you will surprise yourself being able to execute high speed carving and tight turns, while keeping stability at low speed. The RoamBoard includes a battery that powers a 450-watt motor, controlled by tiny hand controller. The advertised range is 12 miles (19.3 km) for a top speed of 15 mph (24 km/h). To control its speed, The RoamBoard includes a hydraulic disc brake system. It also includes relatively large pneumatic tires that absorb shocks and provide a smooth ride. Here is the RoamBoard on video.