Using machine-learning-driven speech processing, the device intermittently records your voice and analyzes its tempo, rhythm, pitch, and intensity to make judgments about “the positivity and energy of your voice” where “positivity is measured by how happy or sad you sound, and energy is how excited or tired you sound.”
A company I work with turned an AI personality diagnosing agent on their support ticket system. They told me the personality it came up with for me was “Polite, but sad.”