I asked them which model it was, and what the mileage was. This is what they said:
"Hi not sure of the millage since the battery ran out when we were driving it and its on the display.... as far as the wattage not sure do you know how to find out?"

Aside from the motor branding, and running it up to a speed greater than 20MPH, I don't know how you would be able to discern the wattage.