In addition, the microphone (transmitter) tends slightly to oversteer when times spoke a little louder and the sound is a bit thin.
I have tested it with different cameras, inserted microphones, settings, etc., and never came to a satisfactory result.
I also own the Canon WM V1 and this is clearly better. No noise and warmer sound. But has not got a way to connect an other mics. Nevertheless, clearly the better choice.