Sony SRS-BTS50 - Manual (Page 39)

flashes slowly.
If you start the BLUETOOTH connection, the system turns on automatically and
starts communication.
Notes
To disable the BLUETOOTH standby function, perform step 1 to 3 again. (The
(BLUETOOTH) indicator (blue) and the system will turn off.)
The BLUETOOTH standby function works when the system is connected to an
AC outlet via the AC adaptor only.
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