Sony GTK-XB72 Help Manual page 26

Hint
If the BLUETOOTH connection is active between the system and a mobile phone (smartphone/iPhone) via HFP/HSP, you can
use the hands-free function while listening to music of the connected external audio device.
If the system satisfies the following conditions for about 15 minutes, it turns off automatically and the BLUETOOTH connection is
terminated.
No operation on the system.
No music (sound) is played on the connected external audio device or the music (sound) of the connected external audio
device is too small.
No BLUETOOTH device is connected to the speaker via HFP/HSP.
Note
When playing music on the connected external audio device, you cannot use
the system to perform operations such as pause, skip to the beginning of the next track, and skip to the beginning of the current
track.
Related Topic
Auto Standby function
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(play/pause) and / (previous/next) on