The letters tacked on after the 4-digit model number primarily indicate different distribution channels. X seems to just mean a general release. R, I think, means retail. RW is Wal-Mart (maybe Retail Wal-Mart?), EU means Europe, there are some others. The basic units are identical, but sometimes a retailer will specify the direct channel access buttons to be included on the remote.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
