@Kelunis
Here you go. (need to order from Roku).
https://www.roku.com/products/accessories/usb-power-cable-with-long-range-wifi-receiver-streaming-st...
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If you have the Roku Streaming Stick 4k, you should have the the 3820 model. (verify by going to Settings/System/About on your Roku device).
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102