Finding specific information about this model is almost impossible, so here are the specs from the manual (which is actually not too bad) that came with mine:
weight: 22 lbs; max load: 220 lbs; max speed: 6.21 mph; range: 7 to 9 miles.
There is absolutely no warranty or contact information, but apparently N.A.I is Hilloamerica Inc, according to my return label. According to the box, Model T6SE has two 250W motors.
Spend some time watching YouTube videos on how to ride and take your time getting used to it. You didn't just buy a bicycle and ride it home the first time - this is similar. And equally dangerous if you're not careful.
But it's a real blast. I'm glad I bought an inexpensive one to try out to see if I may want a "better" one eventually. I've spent a few hours on it in the house, in my driveway, and on the street. There's no way I'm anywhere near it's top speed (yet), it's got a couple of scratches, but I don't!
Highly recommended, but you're on your own if something goes wrong.