there are many different fm systems that phonak offers as for transmitters the smartlink + Is the best it has the most options. it has a built in remote as well as blutooth to connect to your phones or mobile devices. as for receivers it all depends on which you prefer i was reaing that you have a compiot there is a receiver that you can get called an MLXi that clips on the bottom or if you are wanting a more inconspicuous one you can get boots that attach to your naidas in place of the battery door which is what i have!
for all of you who dont know i currently work at a hearing clinic and am going to school to be a specialist so i would be hapy to answer your technical questions like this!