This is one case where you really need to report what Roku model your are talking about, as some just use a standard USB micro cable that runs from the Roku to a USB power adapter, while others have dedicated power supplies with attached cords that connect to the Roku via a round connector.
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
