In the event that you are connecting to the Ceres BT speakers and your Bluetooth connection asks for a pass-code, type in four zeroes in sequence likes this: 0000 and click OK or press Enter.
Older Bluetooth transceivers made with Bluetooth 2.1, 2.0, 1.2 and 1.0 specifications required the use of a pass-code to complete the connection. Newer Bluetooth adaptations starting with 3.0 and higher removed that function making the technology more accessible and user friendly.