Active Noise Cancellation - counters external sound. Noise control button turns on Transparency mode. Beamforming microphones isolate voice on phone calls. Dynamic driver produces sound accuracy. Distortionless playback. Adaptive EQ. Digital Crown control. H1 Chip performance. On-head detection - pause and resume when taken on/off. Designed to fit that creates optimal acoustic seal. Announce Messages. Smart Case preserves battery charge. Up to 20 hours of listening on a single charge with ANC enabled. Includes Lightning to USB-C cable.