Sony WI-SP510 Help Manual page 63

If you cannot connect your Bluetooth device to the headset, delete the headset pairing information on your Bluetooth device and
perform the pairing again. As for the operations on your Bluetooth device, refer to the operating instructions supplied with the
Bluetooth device.
Related Topic
How to make a wireless connection to Bluetooth devices
Pairing and connecting with a Bluetooth device
Listening to music from a device via Bluetooth connection
Disconnecting Bluetooth connection (after use)
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