This product allows anyone to set up or purchase from the Japan eShop store. Gain access to exclusive eShop Themes and Japanese games. As of the Switch release, Nintendo has made the console region free. This means that any users are now able to access the Japan eShop store on any Switch console without limitations. Users must set up a proper Japan eShop account first.
Official Announcement from Nintendo regarding Wii Shop Service:
Per Nintendo statement, Wii Shop service will be discontinued on January 30th, 2019.