https://blog.wongcw.com/2021/10/16/%e5%94%ae%e5%83%b9129%e7%be%8e%e5%85%83%e7%9a%84magsafe-duo-%e4%b8%8d%e6%94%af%e6%8f%b4%e7%82%baapple-watch-series-7%e5%bf%ab%e5%85%85/