Where can I find WiFi Frequencies and output power?

I am trying to get some new macbooks imported into Taiwan and they require some very specific information. I need to be able to list the frequencies and the output power of the wifi cards for each unit, but this information is missing from everything. Not even Apple tech support nor the Geniuses at the Apple store can help me. It is critical to my business that I can get these units through customs, and I cant get the permit without that information. The units I have are, Macbook(early 2015), Macbook Pro 13(early 2015), Macbook Pro 15(early 2015), and a Macbook Air 13(early 2015). All of the other brands of notebooks list this information except Apple, and I would rather not have to buy competitor units. I am at my wits end on this.