The principle of electromagnetism is used to promote safety education. Liu explained that the device helps children to be alert to dangers such as motor vehicles, fast-flowing rivers, electricity, and falls.
目前，劉興欽的新發明「讀書遊樂器」剛取得專利，正著手改良中。這套用電磁學原理操作的玩具，是以安全教育為主題。