The product is a hardback textbook titled “Data Link Protocols” by Uyless D. Black, published by Prentice Hall PTR in 1993. This book, with 320 pages, focuses on the subject area of computers and networking protocols. It is a first edition and provides a comprehensive overview of data link protocols in the realm of computer networking. The book is written in English and measures 9.5 inches in length, 7.1 inches in width, and 0.6 inches in height, weighing 19.4 ounces. This textbook is an essential resource for those interested in understanding the intricacies of networking technology.