Sony WI-C600N Help Manual page 65

If the last-connected Bluetooth device is placed near the headset, the headset may connect automatically to the device by simply
turning on the headset. In that case, deactivate the Bluetooth function on the device or turn off the power.
If you cannot connect your computer to the headset, delete the headset pairing information on your computer and perform the
pairing again. As for the operations on your computer, refer to the operating instructions supplied with your computer.
Related Topic
How to make a wireless connection to Bluetooth devices
Pairing and connecting with a computer (Mac)
Listening to music from a device via Bluetooth connection
Disconnecting Bluetooth connection (after use)
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