Hi Everyone: I have for sale a Kenwood RC-10 remote controller unit, which is meant to be used with the TM-221 and TM-421 radios. I do not know if it works, as it is being sold from the late Jerry Schmitt KK5YY's estate sale, but I really have no reason to believe that it doesn't. Make a reasonable offer, plus shipping! 73, Brian, N5ZGT