Sony SRS-XB31 Help Manual page 34

During playback, you can use the buttons on the speaker to perform the following operations.
Pause
Press the (play) button/
Skip to the beginning of the next track
Press the (play) button/
Skip to the beginning of the current track
Press the (play) button/
Hint
The built-in battery can be charged if the speaker is connected to an AC outlet via a USB AC adaptor (commercially available), or
if connected to a booted computer even while the speaker is in use.
When you set the volume to the maximum (50) or minimum level on the speaker, the
Note
If the communication condition is poor, the BLUETOOTH device may react incorrectly to the operations on the speaker.
When you connect a portable audio device, etc., to the speaker's AUDIO IN jack while listening to music via BLUETOOTH
connection, the speaker switches to the AUDIO IN mode automatically. In this case, music of the BLUETOOTH device is not
output (if the BLUETOOTH connection is active, the hands-free function is available). To listen to music from the BLUETOOTH
device again, disconnect the audio cable from the speaker's AUDIO IN jack.
When using in a place with a high temperature, the volume may decrease to protect the built-in battery.
If the built-in battery level is low, the maximum output of the speaker decreases.
Depending on the BLUETOOTH device, it may be necessary to adjust the volume or set the audio output setting on the
connected device.
Noise or sound interruption may occur depending on the BLUETOOTH device connected with the speaker, the communication
environment or the usage environment.
(call) button during playback to pause. Press it again to cancel pause.
(call) button twice quickly during playback.
(call) button 3 times quickly during playback.
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(power) indicator flashes 3 times.