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After finishing the article, you just need to sweep the text gently with the "Correction Pen" ,and the head of pen will send out different kinds of lights. The light is blue when text is right and turns to red immediately once wrong words or grammatical errors were checked out, and an electronic screen can display mistakes and corrections simultaneously. Apart from that, the "Correction Pen" has the projection function. If you need to teach others something, simply turn on the projector mode, and you can show a presentation anywhere you like to facilitate the exchange between you and others.