Air unit:
0.6776W under FCC
Controller:
5GHz: 0.005~0.0036 depends on frequency range
2.4GHz: 0.0063~0.0048 depends on frequency range
When operating, only 1 antenna work for transmission and both of them work for receiving. If they got similar signal strength, all TX will be done by the omni-directional antenna (2.5dBi), as it is the main antenna.
The emission power was measured with only 1 antenna attached. Under different RF modes, power will be restricted to fit the regulation.
Edited: More detailed explanations