x15 input voltage range?

I can't find a specification for the input voltage range (or power requirements) for the x15, just "12V" and on one page it says 12 V 5 A supply. But is there more precise information available somewhere?

Thanks!

12V is the number. The higher the voltage the higher the heat. I would not go beyond 12.5V if you have to use a cheap power supply.

Gerald