Reading Assistant for Physical Books is designed to enhance the reading experience of physical books by offering voice-activated explanations. It can define words, clarify complex passages, and explain concepts encountered while reading. This tool is ideal for students, researchers, or anyone who prefers reading physical books but desires immediate access to definitions and explanations without interrupting their flow. It is optimized for use with headphones and smart glasses to provide a screen-free experience. While the description highlights its functionality, specific limitations regarding the types of books supported or the depth of explanations are not detailed.