Pling Pling and Pling Pen aim to provide an efficient way of teaching languages. Pling Pen recognizes the small dots printed on paper as meaningful patterns such as a QR code or a bar code and Pling Pling receives a signal and it plays back multimedia content when it touches the area. Multimedia content activates as soon as the tip of Pling Pen, which has the dot-code reader touches the desired area on a book. Pling Pling and Pling Pen are designed and developed to raise interactive educational effect.