Sony DR-BT21IK/B Instruction Manual page 25

The headset indicator flashes quickly: Pairing in process
The headset indicator flashes (at about 1-second intervals) when
responding to the Bluetooth transmitting device: Connectable
(Pairing successful)
The headset indicator flashes (at about 5-second intervals):
Connected
Note
Passcode* of the headset is fixed at "0000. " Depending on the Bluetooth
receiving device, it may be necessary to input the passcode (in this case,
"0000"). The headset cannot be paired with a Bluetooth receiving device whose
passcode is not "0000. "
* Passcode may be called "Passkey, " "PIN code, " "PIN number, " or "Password. "
When not completed pairing
Repeat the procedure from step 2.
To quit "Pairing in process"
Press and hold the POWER button of the headset for about 3 seconds to turn off
the headset.
Note
For using the Bluetooth function, it is required that the Bluetooth device on the
other side is corresponding with the same profile as the headset. However, even if
it is corresponding with the same profile, the function may differ depending on the
specification of the Bluetooth device.
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