How to record the tutorial of booth speakers?

Hold the horn and want to record. After clicking the record button on the control panel, you can start a call with human voice at the same time. Then you can record the whole sound, and finally you can play the recorded sound by selecting the loop speaker. This is a common horn application method in farmers' markets and stalls. Can attract customers as soon as possible. There are recording keys, playing keys, music keys and volume keys on the handheld speaker. When in use, just turn on the switch and press the corresponding button. For example, in the recording function, press the record button first, then say what you want to record into the loudspeaker, then press the record button, and then press the play button, and you can play the content just recorded.