Google Home and Bluetooth speakers make the perfect pair
To get started, pair any compatible Bluetooth speaker with your Google Home: Open the Google Home app, head to device settings and follow the pairing instructions to make it your default speaker. Then give it a whirl. Say “Hey Google, shuffle my workout playlist” or “Hey Google, turn up the volume.” The music will automatically play on your Bluetooth speaker—without you having to tell Google the name of the device.
Source: Google Home and Bluetooth speakers make the perfect pair