1. On your iOS device, go to Settings > Bluetooth, 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, you will find it on the other device menu of your mobile device.

4. Select the CPA Loudspeaker to connect.

5. Once your Bluetooth connection is all set, the BT/TWS light turns solid BLUE. Now, you'll see the CPA Series speaker on your mobile's Bluetooth menu.  
Time to make some noise!

IMPORTANT!

• You can reset Bluetooth settings and clear all connection records by holding the PAIR button for 5 seconds. When you've done it, the BTS/TWS LED will blink PINK(PURPLE) twice to confirm.
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• If your CPA Series loudspeaker has been previously paired with another mobile device that is still within range while you’re attempting to pair it with a new device, you may need to disconnect the previous device first to successfully connect the CPA Series speaker to the new one.

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Further Reading:

_{Resolve Wi-Fi and Bluetooth Issues Caused by Wireless Interference
‍https://support.apple.com/en-us/102319}