Sony SRS-BTS50 - Manual (Page 86)

If the caller cannot or can barely hear your voice, talk into the microphone of the
system.
To end a call
Press the
(call) button.
When you finish using the system
When you finish using the system, perform either of the following operations.
Turn off the BLUETOOTH function on the BLUETOOTH device connected to the
system.
Turn off the BLUETOOTH device connected to the system.
Turn off the system.
Touch the smartphone to the system again (if your smartphone has the NFC
function)
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