https://qooah.com/2012/01/27/samsung-%e8%80%83%e6%85%ae%e6%8e%a8%e5%87%ba%e9%85%8d%e5%82%99-s-pen-%e7%9a%84%e6%89%8b%e6%a9%9f%e5%8f%8a%e5%b9%b3%e6%9d%bf%e9%9b%bb%e8%85%a6/