https://blog.wongcw.com/2021/10/14/bose%e6%8e%a8soundlink-flex%e8%97%8d%e7%89%99%e6%8f%9a%e8%81%b2%e5%99%a8-%e5%94%ae%e5%83%b9149%e7%be%8e%e5%85%83/