Air Brakes ,The battery used on the bike in that link is a twin to the batteries used on the 3 Espin bikes I've bought in the last few months. As mentioned earlier, all 3 of those all say "Reention" on them...
If you're up for a grin, note the front tire on the bike in the pic has had the front wheel installed backwards. The disk is opposite the caliper... Mental giant there for sure! Not the sort I want to buy from....
I have seen people riding around like that. There is guy who works at my closest supermarket who has the forks flipped 180. Mentioned it to him, doesn’t,t care
Someone was selling a mission here last weekend, pics show forks on backwards.