https://purengom.com/2008/12/30/ipod%ec%9d%84-%ec%a1%b0%ea%b8%88%eb%a7%8c-%eb%8d%94-%ec%82%ac%eb%9e%91%ed%95%b4%ec%a3%bc%ec%84%b8%ec%9a%94-apple-in-ear-headphones-with-remote-and-mic/