The product is a textbook titled “Twentieth Century Computers and How They Worked” written by Jennifer Flynn and published by Alpha Books in 1993. It is a hardcover book with 161 pages, focusing on the history of computers in the 20th century. The book is in English and contains features indicating it was previously part of a library collection. The subject area is computers, specifically exploring how computers operated during the 20th century. All books are bagged and backed and shipped in a gemini mailer.