Sony DR-BT21IK/B Instruction Manual page 22

5
Press and hold the power button of the transmitter for about 7
seconds or more to enter "Pairing in process."
After about 1 second, the transmitter indicator will flash twice,
but keep pressing the power button.
Notes
 When first power on the transmitter after initialized, the transmitter will
enter "Pairing in process" automatically.
 The pairing information is initialized if you press and hold the power button
for 15 seconds. The transmitter indicator lights up for 5 seconds before the
initialization starts. Release the button immediately when the transmitter
indicator lights up.
When the transmitter indicator flashes quickly, stop pressing.
The transmitter enters "Pairing in process. "
The transmitter indicator status will vary as follows, and pairing
is established with the Bluetooth receiving device.
The transmitter indicator flashes quickly: Pairing in process
The transmitter indicator flashes (at about 1-second intervals)
when responding to the Bluetooth receiving device: Connectable
(Pairing successful)
The transmitter indicator flashes (at about 5-second intervals):
Connected
Notes
 "Pairing in process" of the transmitter is released after about 5 minutes. If
pairing is not established within about 5 minutes, repeat the above
procedure from step . iPod backlight may turn on in this 5 minutes.
 To enter "Pairing in process," you need to turn off the power of the
transmitter first.
When not completed pairing
Repeat the procedure from step 2.
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