ACAA 2.0: Our exclusive coaxial dual driver technology delivers high and low frequency sound directly to your ear without interference. Its wide soundstage is detailed and spacious, bass has a deep punch, mids are luscious, and treble sparkles. Personalized Noise Cancelling: Standard noise cancelling only adjusts noise based on data. HearID ANC analyzes your ears and level of in-ear pressure to create a tailored profile that optimizes noise reduction and reduces external sound to suit your ears.