Sony MDR-AS700BT - Manual (Page 46)

The headset may be connected with the smartphone as soon as you turn on
both devices.
Check the connecting status on the smartphone. If not connected, proceed to
step 2.
2. Make the BLUETOOTH connection from the smartphone.
Touch [Settings] [Bluetooth]. Make sure that [Bluetooth] is set to on, then
touch [MDR-AS700BT].
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