Do you really want to buy a ESC with knowing only the maximum voltage and the current?
If the manufacturer has no need for further information, he also has no need for your money.
There many well documented controllers on the market, you should take one of them.
Dominik
"Zwei Dinge sind unendlich: Das Universum und die menschliche Dummheit. Aber bei dem Universum bin ich mir noch nicht ganz sicher" Albert Einstein