Meet the Airwheel Q6: an electric unicycle with a waterproof design and a range of up to 17 miles. It has a max speed of 12 mph. The unicycle has a 800W motor and weighs 10.5kg. It is easy to learn and provides you with a fun, stable ride.
You can charge these in 1.5 hours. The Q6 unicycle sets you back under $400 at this time.