More information, such as model numbers, might help, but in general the remotes that ship with the vast majority of TVs are IR remotes. These send simple codes via infrared light and have no pairing - they simply control anything they are pointed at, as long as it uses the same codes. And since light can reflect, sometimes they will bounce off stuff and not require direct line of sight.
However, I think all Roku TVs can be paired with a Roku RF remote. Those use Wi-Fi and involve an actual pairing process.
