Looks like you twist the right side or maybe both grips to make it go or maybe row the handlebars and foot pads back and forth like the tandem thing on a swingset to make it move forward.
i have to have one of these.. nobody told me you could take a nap while someone drives you about ..
I am big on naps... I need all the beauty sleep i can get ...
Reminds me of Fritz von Opel's efforts to make one of the motorbikes his father built in his factory faster:
While we are at it, here are all von Opel brothers:
All of them where accomplished cycle racers.
However, Fritz must have been the most normal of them all. He attached rockets to anything he could get his hands on. Cars, bikes, motorboats, even a glider plane and a railway draisine.