To pair a Bluetooth-enabled speaker with the Amazon Echo:
1. Power on your external Bluetooth speaker and start pairing.
2. Head to the Alexa app (you can also use the alexa.amazon.com web app)
3. Go to Settings in the left menu.
4. Choose Devices, and select the Alexa device you want to pair
5. Tap Bluetooth
6. Choose Pair a New Device.
7. You should now see your external device listed. Tap to pair.Support for Amazon echo | Amazon echo support | Echo Dot Setup