The first switch enables or disables the speed announcements.
By default, announcements are active.

Activating the previous choice gives the possibility to adjust the volume of the speed announcements or to use the volume of the phone.
If the second switch is on, an adjustment bar appears that allows you to adjust the speed announcements volume.
If it is off (default option), the phone sound volume is used for announcing the speeds.

If the third switch is on, an adjustment bar appears that allows you to adjust the speed announcements volume.
The sound level of the speed announcements is independent of the phone volume setting. For example: if the phone sound is muted, the speed announcements are still emitted with the desired setting. From Android 9 additional authorization is required.
If it is off (default option), the sound phone volume is used for speed announcements.
The first switch allows you to enable or disable the speed alarms.
By default, alarms are active.

Activating the previous choice gives the possibility to adjust the speed alarms volume or to use the volume of the phone sound.
If the second switch is on, an adjustment bar appears which allows you to adjust the speed alarms volume.
If it is off (default option), the sound phone volume is used for the alarm annoncements.

If the third switch is on, an adjustment bar appears which allows you to adjust the alarms volume.
The level of audible alarms is independent of the phone volume setting. For example: if the phone sound is muted, the alarms are emitted with the desired setting. From Android 9 additional authorization is required.
If it is off (default option), the sound phone volume is used for the alarm annoncements.