Pens are an essential part of our lives. We use pens all the time when teachers are working, when students are doing homework, etc. But pens in real life still have many inconveniences. For example, when writing with a fountain pen, you need to refill the ink frequently. It is still very cold when writing with a fountain pen in winter, so I want to invent a magical pen. The pen of the future will be cylindrical and have many functions. The pen of the future will be equipped with an automatic controller and an ink reservoir. When you finish writing, the ink will be automatically added to the pen tip. This pen is equipped with a micro air conditioner in the middle. Just press the green button on the pen and it will be particularly cool. You won't feel hot when writing in summer. In winter, it will be very cold when writing with a fountain pen. Then press the red button and heat will immediately come out, which is very comfortable when writing. There are four sensor lights on the upper end of the pen tip. It will illuminate normally when it is twenty centimeters away from the book. If it is too close to the book, it will emit dazzling light, making it difficult for you to see what you are writing. With sensor lights, you don’t have to worry about your eyes becoming short-sighted. In addition, there is a typo detector in the pen. If you write a wrong word, it will make a "beep" sound to remind you, so that you will not write a typo even now. There is a small MP3 player on the top of the pen that you can listen to to relax while doing homework. This pen not only allows us to avoid writing typos, but also improves our interest in learning and allows us to be relaxed and happy. Learn.