[tobyportugal]

With transmission there is no need for LCD, but is a personal choice.

From testing versions, the transmitter was setup to work alongside Tx 1, so set to the same ID as Tx 1 in the receiver. The AQI is a physical transmitter in its own right.
If this is different now, Werk or another of the development and testing team will correct 

Hope this helps in the meantime.

Hello,

Thank you for your explanations.
I have just seen the PARTS LIST, maintaining it is clearer.

Good weekend