Sony MDR-AS700BT Help Manual page 73

Help Guide
Switching the device by one-touch functions
When the headset is connected with a BLUETOOTH device, if you touch an
NFC compatible smartphone on the headset, the headset is connected with the
smartphone that touched on the headset most recently.
If you touch the smartphone that is connected with the headset on another NFC
compatible BLUETOOTH headset or BLUETOOTH speaker, the smartphone is
disconnected from the headset, and connected with the BLUETOOTH device
touched.
Note
Unlock the screen of the smartphone beforehand. If you installed the "NFC Easy
Connect" App in the smartphone, start the "NFC Easy Connect" App.
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