It has a snug harness which is audible, thus helping to assure you that you have your baby safely in place with voice cues. (babieslounge.com)
I always teach both a hand and voice cue for this behavior. (dogchatforum.com)
A report in June said Amazon was also working on emotional detection through voice cues, though the current Echo does not have facial recognition sensors. (techhive.com)