The image shows an open book with an illustration of a bus board and cables. The book is resting on a wooden desk with a stack of books and a wooden stand next to it. On the left side of the image, there is a white electronic device with a green label that reads "STROM". On the right side, there are two pages of the book, one with an image of a circuit board and the other with a diagram of the bus board. The text on the pages explains how to use the device and how it works.