Choose the smallest unit to display in verbose mode. If the remaining time yields a value of 0 for that unit, the next smaller unit will be chosen automatically.
可选：可以设置一个音频文件，当计时器到期时播放该文件。请注意，当自动启动计时器时，除非用户先与页面交互，否则浏览器可能会阻止播放信号。Choose the smallest unit to display in verbose mode. If the remaining time yields a value of 0 for that unit, the next smaller unit will be chosen automatically.
Optionally set an audio file that should be played when the timer has expired. Please note that when starting the timer automatically, the browser may prevent playing the signal unless the user has interacted with the page first.
None
可选：可以设置一个音频文件，当计时器到期时播放该文件。请注意，当自动启动计时器时，除非用户先与页面交互，否则浏览器可能会阻止播放信号。Choose the smallest unit to display in verbose mode. If the remaining time yields a value of 0 for that unit, the next smaller unit will be chosen automatically.