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TheThere are have been four PCB revisions for the WiiKey so far, the current version is v4. Below is a guide on checking which version of Original WiiKey you have.
Differences between WiiKey v1 to v3
WiiKey V4 now comes with special PTH pads which make directly soldering the WiiKey a much smoother process. You can see from the diagram below that the WiiKey v4 solder has flowed a lot better.
Differences between WiiKey v3 to v4
