Finding Books Not Hard

When we go to library, we start to find the books that is wanted. But, It is very difficult to find that, because people who read the books don't get back the books! We may experience the situation that cleary, screen of search result says "You can borrow this book", however, we don't find it. So I want to invent the device that find the books.(The premise of this is that the books has chips which have their information.) Its size is a palm. We write the book's class numbers that you want to find. Then the device send and recieve the information of the book that has that number. That time, this device detects that book's location. Next, the device lases to that. As the people follow that laser, they can find the books! Many people who want to find the books can use this! Maybe it device isn't expensive because its principal is like radio paging technology.