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Volume adjustment
4.13.
Click the volume button to enter the volume adjustment page, you can adjust the speaker
output and headphone output at the same time, the volume adjustable range is 1 to 16, 16 is the
maximum volume,Support power-off memory.
Service application
4.14.
Participants can send "tea application", "paper and pen application", "manual service
application" to the background according to actual needs, click on the service item on the menu
page, and enter the page for sending the application. At this time, you can choose the application
items to be sent.
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