There's nothing special about the Roku HDMI extension, it's just a short (4 inches or so) HDMI cord with an HDMI plug at one end and an HDMI socket at the other. I use one several feet long to locate my Streaming Stick+in an equipment closet on the other side of the wall from my TV. You may be able to find an HDMI extension locally and not have to wait for someone to ship it to you.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Do not ask me 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 | Streaming Stick 3600
I was promised that my info would be passed onto support and support would contact me. It’s been a week. Absolutely no contact from Support. I no longer have interest in a product by a Company that treats its customers so badly. If you make promises to a customer Follow Through or suffer the consequences of lost customers. Returning it to store and you can be certain I am informing everyone I know of the poor treatment I have received from the Roku Company.