Sony SRS-BTS50 - Manual (Page 73)

Help Guide
Switching the device by one touch
When the system is connected with a BLUETOOTH device, if you touch a
smartphone on the system, the system is connected with the smartphone that
touched on the system most recently.
If you touch the smartphone that is connected with the system on another NFC
compatible BLUETOOTH headset or BLUETOOTH speaker, the smartphone is
disconnected from the system, and connected with the BLUETOOTH device
touched.
Copyright 2013 Sony Corporation
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