Segway redux, no sound because it sounds like Hong Kong International Airport, 1 inch of plastic separating you from massive blades that can easily remove your foot.
When I was a kid in the 80s there were plans for sale in the back of Popular Mechanics to build one of these out of an old vacuum cleaner motor and some plywood. I have a feeling this one is better.
I have a feeling they just took the few seconds of each time the thing didn't crash or otherwise malfunction and slapped those descriptive labels on the clips.