录音喊话，可以将喊话内容保存起来，重复播放。可以重命名，删除。
下次使用刷新目录，播放即可。
The recording upload broadcast function can save the message and play
it again.It can also be renamed and deleted.Next time, refresh the
directory and play.
实时广播，可以像对讲机一样按住快速喊话
The live broadcast function can shout as fast as a walkie-talkie.
