|This briefcase-sized electric unicycle that keeps a rider perfectly balanced at all times with gyroscopic sensors. The unicycle’s 500-watt electric motor hat can push a 160lbs man at 13mph for up to two hours on a three hour charge. It can support riders up to 250 pounds, but your mileage will vary depending on how close you get to that limit. Like the Segway, accelerating and stopping the unicycle is accomplished by gently leaning forwards or back. It shouldn’t be that hard though, and once you get the hang of it, you’re sure to get a lot of enjoyment out of your $2,700 expense.