if it weren’t for the worrying-looking spacing on the USB port I’d say this is a cool, but very strange, device
shoutouts to the people who responded to this picture by telling me “it’s an action replay pro for wii,” you make the world go around
actual context: I found this listed on Amazon as an SD card adapter, not an Action Replay, I found the Action Replay by looking for the same keywords, and found an eBay listing which again lists as an SD adapter despite having the picture which says Action Replay pictured
(which explains their need for your Wii’s Wi-Fi MAC address, as this exploit requires that, too)
it is very likely that this is merely a generic microSD to SD / USB adapter and that its relation to Action Replay is for convenience (USB) at best; it looks likely that Action Replay are using a well-known Wii Message Board exploit called “LetterBomb” http://wiibrew.org/wiki/LetterBomb