Human infants are sometimes considered obligate nasal breathers, but generally speaking healthy humans may breathe through their nose, their mouth, or both.
Generally speaking, the processes developed to date either have poor thermodynamic efficiency (high overpotential), low current efficiency, low selectivity, slow kinetics, and/or poor stability.
The unit is capable of locomotion, using visual navigation to avoid obstacles, speech recognition, emotion recognition (whether audio or gestural is not stated), and speaking.