If you get any Roku TV that comes with a remote from the manufacturer (i.e., not one of the Roku Voice Remotes) it will control any TV from that manufacturer (e.g., TCL, Hisense, onn, etc.). So, if your main TV is from the same manufacturer as the Roku TV the remote will control your main TV. Even the Voice Remote once configured to control one TV will control all TVs from the same manufacturer (unless it's configured to use CEC).
There also may be some overlap where different manufacturers use the same code set in their remotes.
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