https://blog.wongcw.com/2020/10/17/apple-watch-productred-solo-loop%e5%92%8c%e7%b7%a8%e7%b9%94%e9%8c%b6%e5%b8%b6%e7%8f%be%e5%b7%b2%e4%b8%8a%e5%b8%82/