What is the function of Ev-pen dot matrix digital intelligent recording pen of Shanghai Yusheng Information Technology Co., Ltd.? be worth

Personally think it is worth buying. It uses dot matrix technology to combine pen and paper writing with recording perfectly and apply it. Students write and take notes normally, and students' notes are instantly electronic. At the same time, record the voice of the teacher's lecture and package it in the same file with the notes. When students review, they don't just use a pen to find out what they don't understand. The teacher's lecture voice will be played back immediately, and they will really realize what they don't understand! It seems that teachers are always around students, which is a sharp weapon to improve their grades and a good helper to learn.