The US models have a power output of 20dBm and european versions 16dBm, I live in Asia and we diffrent kind of stock from all around the world but its not easy to determine which version we actually have, both the receiver and phantoms should be labeled but I had no luck getting anykind of info on the net. Anyone has an idea ?

Power output has to do with the gps and where your at on the planet. So if I'm in America my phantom will have 20dBm then if I fly to Europe with that same phantom it will have 16 dBm. That's how I understand it. If I'm wrong someone please correct me.

It's written on a back side of your remote controller

I know the serial number is, but how can I tell from the serial number if the 16dBm or the 20 dBm version ?