Sony HT-RT3 Mode D'emploi page 19

Menu items
"SYS >" "ASTBY"
(System) (Auto standby)
"VER"
(Version)
Function

"ON": Turns on the auto standby function. When you do
not operate the system for about 20 minutes, the system
enters standby mode automatically.

"OFF": Off.
The current firmware version information appears in the
front panel display.
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