Sony SRS-X99 Help Manual page 219

5. Tap [Auto Standby] to turn on/off the auto standby function.
When the auto standby function is turned off, tap the
speaker since it will not be turned off automatically.
Related Topic
Using the BLUETOOTH/Network standby function
Standby mode differences
Auto standby function
(on/standby) button on the speaker to turn off the
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