Sony SRS-X99 Help Manual page 201

Help Guide
How to Use
Personal Audio System
SRS-X99
Auto standby function
The speaker automatically enters standby mode or switches to the BLUETOOTH/Network standby mode if the speaker
remains in any of the following states for about 15 minutes.
No operation of the speaker.
Connection/disconnection operations to the speaker from external devices have not been performed.
Music (sound) is not played while connected to an external devices.
Hint
Charging a USB device continues even when the speaker enters standby mode or BLUETOOTH/Network standby
mode.
You can use SongPal to turn off the auto standby function.
Related Topic
Setting the auto standby function
Standby mode differences
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