This is a roku tv? Only roku tv IR remotes have no pairing key but have volume keys. Non-tv Roku remotes only have volume keys when there's a pairing key in the battery compartment. Because only wifi roku remotes have tv controls. Unless its roku tv remote.
Older roku remotes with headphone jack built-in have volume keys, they only control tv by hdmi-cec. But they also have pairing keys. And none of them have mute keys.
Edmund
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