[Hodar]

I want to know more about the 2 speed automatic transmission.

Essentially you peddle with the same load and there are ininite gears that automatically go up and down depending upon what load the bike is carrying and the terrain. High Low are the two “speeds” you control; are you on the highway or in a hilly area?
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These were insanely expensive at one point in time (> $1,000) just for the transmission. For this in a $400 bike is incredibly impressive.

[TChad]

...there are ininite gears that automatically go up and down depending upon what load the bike is carrying and the terrain.

That's a continuously variable transmission. I did not see in the bikes' product description or reviews that it has such a feature. It has two speeds. If you go faster than a given velocity, it automatically shifts up. Slower than a certain velocity, it shifts down.

I hope I am wrong, because two speeds is not enough.