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This old page makes it look like it was a real product, unclear how it was sold though. Also no product name, oddly...

https://web.archive.org/web/20160304171428/http://www.pixen-...

“臭気発生装置 WA-1型(Odor generation device Type WA-1)” seems to be the name. Listed on Rakuten for about $516 but not sure if it’s in stock or merely listed there.

Looks like it works as a wireless slave device for compatible smoke detectors, with one included in the kit.

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