HearID ANC active noise cancellation not only automatically adjusts to the noise level around you, but also individually adjusts to your ears. HearID's proprietary technology examines the way sound moves in your ears, as well as the pressure in your ear. The technology then creates a custom profile that precisely optimizes sound isolation for you, your ears, and your environment. Liberty 3 Pro offers you a variety of ways to customize and enhance your listening experience so that it is truly your own. Liberty 3 Pro supports LDAC technology for a Hi-Res Audio Wireless certified listening experience. It transmits three times the amount of data from your device to the earphones to preserve every detail of your favorite music. Headphones that sound insanely good to you may be insignificant to someone else. To ensure fans enjoy an ideally tuned sound profile with Liberty 3 Pro, the smart HearID program checks your hearing and music preferences and precisely adjusts the sound. The noise-canceling effect as well as the pressure relief in the ear are carefully balanced to provide just the right amount of comfort and noise reduction. Ideal for quieter environments. The low level reduces pressure in the ear for even more comfort and effectively filters out background noise, for example in the garden or library.