I have no idea about all this , the hobby king 2.4g stuff came with no instructions at all.
I may have come to the wrong conclusion. Is this a Spektrum brand radio or some other 2.4 Ghz system? You said Spektrium but did you mean 2.4 Ghz. The 2 main players in 2.4 are Spektrum/JR and Futaba but I'm unfamiliar with any others that may be out there. If it is not in fact a Spektrum brand radio then the 3 channel rx isn't necessarily a surface RX. Spektrum doesn't make a 3 channel air rx but someone else might. If it is a Spektrum brand then it should have come with a manual (which can be downloaded off Horizon Hobby's site). If not you'll need to contact the seller.
Mike