1. On your Windows PC, Go to Start > Setting > Device > Bluetooth & Other Device and turn on Bluetooth.
2. Press the PAIR button ONCE on the back panel of the CPA loudspeaker, the BT/TWS light blinks in BLUE when it’s in the discovery mode.
3. When a nearby CPA-Series speaker is detected, add the CPA loudspeaker and get it paired.
Alternatively, you can go to the bottom taskbar to show and add a Bluetooth Device
4. Once your Bluetooth connection is all set, the BT/TWS light turns solid BLUE. Now, you'll see the CPA Series speaker on your Windows PC's Bluetooth menu.
Further Reading:
Bluetooth Connection Problems
https://www.carver-pro.com/faq/bluetooth-connection-problems
Pair a Bluetooth device in Windows
https://support.microsoft.com/en-us/windows/pair-a-bluetooth-device-in-windows-2be7b51f-6ae9-b757-a3b9-95ee40c3e242