Ah yes , that's the power source. Um.  going on to personal preferences , I've said that battery seems the best option for the actual remote , just because of the size. You don't want a a cable attached to the remote otherwise it's not it's not really a remote. Um and then the sender ,
and infra-red um has been used quite successfully. If the battery's on reasonable power , they always seem to work fairly well. You don't have to be point directly at the television itself.
So the battery is the  in the sender.
Um  Yes. 'Kay and that's it for the moment.