My late father had a unit similar to that,Roger..Cant remember what brand it was,,but it had a remote for the volume,,and it worked well.. (much to mum's disgust).. Only took a second for dad to go ''deaf'' once she started bleating at him.. I have lost about 20% of my hearing,I think,,blame loud music,,power tools,,and unmuffled V8's..and the dragstrip off course..