GENUINE SONY RM-SC50 AUDIO SYSTEM REMOTE - MHC-EC50 CMT-GB3 CMT-HPZ7 CMT-HPZ9
I test everything before it goes out. If you get a remote and it does not work, it could be for a number of reasons such as not the correct remote or an issue with the IR sensor on the unit (that's what picks up the signal from the remote).