Features (US and Tourist models ) • Digital noise canceling headphones with Sony’s unique DNC Software Engine. Creation of a high-precision canceling signal delivers outstanding noise canceling performance. • AI (Artificial Intelligence) Noise Canceling function. Automatic selection of the optimal noise canceling mode based on intelligent analysis of environmental ambient noise. • Digital equalizer delivers ideal frequency response and high-quality music reproduction. • High S/N ratio achieved through digital signal processing. • Lightweight design creates extremely comfortable wearing fit. Generous use of lightweight materials such as Magnesium and A7075 aluminum alloy. • Pressure relieving urethane cushion in the earpad. The earpad structure provides comfort without stress even after extended use. • Built-in monitor function lets you silence the audio to listen outside.