If you have a Roku remote with a headphone jack that works with your old square Roku player, be aware your Roku headphone earbuds for private listening will not work with a Roku Streaming Stick 4k .
You can pair it with the Stick 4k for changing channels but no sound will come thru the headphones plugged into your remote control. The conflicting advice I got from chats with Roku agents on the Roku.com support webpage showed a lack of product knowledge about the Streaming Stick 4k.
I also noticed the remote they provide with the Streaming stick 4k has no headphone jack on it.
DanP