The product is a 2nd edition hardcover textbook titled "Technical Aspects of Data Communication" by John E. McNamara. Published by Elsevier Science & Technology Books in 1988, this textbook is focused on the subject area of computers and data processing. Authored by John E. McNamara, this technical-level text covers the technical aspects of data communication in 383 pages. The book is written in English and measures 9.8 inches in length and 7.5 inches in width, making it a valuable resource for those interested in the technical aspects of data communication.