https://qooah.com/2015/11/27/air-button-%e9%bb%8f%e8%b2%bc%e5%9c%a8%e6%89%8b%e6%a9%9f%e8%83%8c%e9%9d%a2%e7%9a%84%e6%8c%89%e9%88%95%ef%bc%8c%e9%80%8f%e9%81%8e-nfc-%e5%b8%b6%e4%be%86%e5%90%84%e7%a8%ae%e5%bf%ab%e6%8d%b7%e7%9a%84/