The product is a set of two paper books titled: "Linear & Interface Circuits Product Applications Volume 1. Op-Amps, Comparators and Tuner, and Voltage Regulator", and "Linear & Interface Circuits Product Applications Volume 2. Display Drivers, and Data Transmission Line Circuits". Both published by Texas Instruments in 1986. These books provide information and guidance on electronic components and circuits, specifically focusing on linear and interface circuits. As products of Texas Instruments, they contain detailed technical information and practical examples for those working in the field of electrical engineering and electronics. The books would be a valuable resource for engineers and technicians seeking to expand their knowledge and skills in this area.