You will need a board and receiver as a minimum to get started. You can re-using your existing transmitter if you already have one.
You can have multiple receivers per transmitter and you can use the same receiver for different wireless controllers. Any receivers/transmitters you purchase will be paired together. If you are unsure about your use case, please send us a quick email to firstname.lastname@example.org.
To prevent double listing of transmitters, you should purchase them from their listings:
Please note that there is no encryption or security available for these devices, while this should pose no issue for home users, it would be possible for an attacker to potentially take over your controls or block your control.