I have done some further testing on the binding. With only one transmitter I am not sure I can unbind the receiver but here is what I have observed. If the system is up and running with the two bound together and I press the bind button on the receiver it starts trying to bind to the transmitter but never does unless I turn the transmitter off and then on which is good as it suggests you only have to worry about other transmitters that are turned on as you are trying to bind yours. If with the system up and running and you press the bind button as before it fails to bind but if you cycle the receiver off and then on it also seems to bind. This may actually be that it has not lost the binding from before as I say without a second transmitter it is difficult to tell.