Although basic Express models come with a simple infrared remote, they are also capable of being controlled by the Roku Voice Remote models which connect via wifi direct. I suspect you're seeing the wifi-direct channel the Voice Remote can use.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
