The product is a first edition hardcover book titled "das Princip Der Erhaltung Der Energie" by Max Planck, published in Leipzig in 1887 by B.G. Teubner. Written in German, this book falls under the genre of physics and is considered a significant work for understanding the conservation of energy. As a key figure in the development of quantum mechanics, Max Planck's ideas presented in this book have had a lasting impact on the field of physics.