Why is there no sound in the voice broadcast paid by CCB Dragon?

Why is there no sound in the voice broadcast of CCB Dragon Pay: 1? Open your mobile phone and log in to CCB app, and log in to your account. 2. Open the message reminder for setting voice broadcast, and click "Open". 3. Set the CCB app to "Open" in the mobile application self-startup management interface. Note: You need to turn on the Bluetooth speaker and mobile phone network, and successfully connect to the mobile phone before you can broadcast the voice.