I could not get the plug to fit into my Mega Drive 2 and could not get picture or sound. It turned out that the diameter of the AV plug shielding is a little too big when trying to connect it. I had to trim the shielding and it now fits perfectly.
I bought the AV cable because the RF one I had with the Mega Drive was not working very well with LCD TVs. The sound kept cutting out at times, but its no issue with this new AV cable. I get a better picture and stereo sound that doesn't cut out at all, and I can now play my Mega Drive! Very happy customer!