Yes the windscreen wipers would not be easy to construct in terms of batteries and motors - but that is why we need a greater mind than mine to think it through and engineer the logistics 
Hmmm… I’ve just had a brainwave of a good way of doing it.
Let me know when you have thought through the structural mechanics of it and we’ll pitch it to the Dragons and split the proceeds:D
Lol forget diluting the company.
As I said I don’t want a wiper hanging out of my eye which is very likely considering how they are mounted in that vid.
i want one ! 
Someone else got their first! Oh No! However, I think some modification of these may be necessary for health and safety reasons. If it’s not patented, then Dragon’s here we come 