While it is possible to play audiobooks on your Alexa device via a bluetooth connection, it's not voice activated at the moment. We hope to have this feature soon!
Below are the instructions for listening right now:
1. Open the Amazon Alexa app.
2. Open Settings (top left navigation)
3. Open Device Settings
4. Select Alexa device and pair bluetooth
5. Open the Libro.fm app and play your audiobook
Note: Once your device has been paired in the app, you can simply say "Alexa, pair my device" in the future when you want to listen.