Sony MDR-AS700BT - Manual (Page 39)

Help Guide
Pairing and connecting with an Android smartphone
It is necessary to pair BLUETOOTH devices to establish a BLUETOOTH
connection. When pairing the headset with a smartphone, place the smartphone
within 1 meter (3 feet) of the headset.
1. Enter pairing mode on the headset.
Press and hold the POWER button for more than 7 seconds.
Make sure that the indicator flashes blue and red alternately after you release
the button.
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