Why did the remote for my Roku have trouble connecting after replacing the batteries?

Episode 981 (2:12:10)

Tom from Warren, OH

Tom bought the Roku 3 so he can "cut the cord". Leo says that the Roku is a great option. The new thing is that it has a remote control that has a built in headphone jack so he can watch TV and not bother others. Tom says he uses it all the time but it recently had trouble connecting after the batteries died. He had to reset it and put it into "enhanced pairing mode" in order to get it done. Leo says that battery powered devices may require the remote to be reset so that it can be reacquired by the Roku.