The device is maintaining a short (<1 sec) buffer at all times. The device is Echo; Alexa is the cloud-side service, which is definitely not getting the audio u

The device is maintaining a short (<1 sec) buffer at all times. The device is Echo; Alexa is the cloud-side service, which is definitely not getting the audio until the wake-word is spotted and then streaming begins (backing up to the beginning of the buffer).