Jangbu Ilsaek 1990 - Portable

Searching online, maybe there's a product from the 90s. Portable devices from 1990s, like cassette players, boomboxes, or early portable electronics. The user might be referring to a specific brand/model that's obscure. If I can't find any info, I should inform them that the product isn't well-known or documented. Alternatively, maybe they meant a different term. "Ilse" could be a typo for "iLse," but that's not standard. Alternatively, "Ilse" might be a brand name.