Sony SRS-XB31 Help Manual page 51

Press the –/+ (volume) buttons to adjust the volume.
5
When you press the –/+ (volume) buttons, the
maximum (50) or minimum level on the speaker, the
Hint
When you cannot hear the sound, raise the volume on the connected device.
If the BLUETOOTH connection is active between the speaker and a mobile phone (smartphone/iPhone) via HFP/HSP, you can
use the hands-free function while listening to music of a portable audio device, etc. that is connected to the speaker's AUDIO IN
jack.
Note
If you connect an audio cable to the AUDIO IN jack, the output from the device connected to the AUDIO IN jack has priority, and
you will not hear the sound from the BLUETOOTH device. The
the BLUETOOTH status. Absence of sound from the BLUETOOTH device does not indicate any trouble with the speaker.
Even when the audio cable is connected, you can switch to the BLUETOOTH mode on "Sony | Music Center," and listen to music
from the BLUETOOTH device connected via BLUETOOTH.
When connecting a portable audio device to the AUDIO IN jack and playing music, you cannot use the buttons on the speaker to
perform operations such as pause, skip to the beginning of the next track, and skip to the beginning of the current track.
Do not use the AUDIO IN jack in a place where water may splash.
Related Topic
Auto power off (Auto Standby) function
(power) indicator flashes once. When you set the volume to the
(power) indicator flashes 3 times.
(BLUETOOTH) indicator lights up or flashes in blue to indicate
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