Apple will tell you how to turn up the volume.

Adjust the sound size of Apple notification as follows:

1. Open the Settings application for the device.

2. In the setting menu, find and click the "Sound and Touch" option.

3. In the setting of "Sound and Touch", you can see the option of "Ringtone and Reminder", where you can adjust the size of the notification sound.

4. If necessary, you can also turn on the "Press the button to adjust" option, so that you can use the physical volume key (side volume key) to adjust the size of the notification sound without affecting the volume of media playback. Please note that when adjusting the volume, if the device is playing music or video, the volume button will only adjust the volume of the media and will not affect the notification sound.