The background and character design of this book are very interesting, and I really like it. Moreover, this book also has a volume control function, which allows me to freely adjust the background music while reading, which is very comfortable. At the same time, the background music of this book is also very suitable for the story theme and task, giving me a sense of immersive experience when watching. But I don't really like the position of the buttons in this book, it would be even better if I could change the position.