V3,OS7.10 :The volume adjustment operation can not be implemented in the configuration file

So like I said above, you need to follow the Set Up Instructions for my Prop on this page:
See “Set Up for Voice Prompts (Required)” and the other Set Up sections

If you don’t do the Required set up the features of the prop do not work.

If you need help setting the config up use the Config Tool and it will do the config parts for you BUT you still need to set the Voice Prompts up in “common” on your SD card.

Thank you very much !
I will do what you said .
And I want to set the volume to 50% ,40% , 30%…80% etc…

See controls for “Volume Menu” on the same page AFTER you set the config up correctly.