Hear only what you want to with background noise on mute. Featuring Sony's advanced digital signal processing technology, ambient noise is reduced by up to 98.2% with these mdr-nc200d premium digital noise cancelling headphones. Whether you're at the office, on a plane or train, built-in artificial intelligence (AI) technology automatically adjusts to your surroundings to offer the optimal level of noise cancelling customized to the environment and sound conditions. High quality audio is yours with 40mm driver units, full digital amplification and a high performance digital equalizer delivering the highest highs and lowest lows for incredible-sounding music. Cushy, feather-soft ear cushions provide maximum comfort, plus an ultra-compact, collapsible design makes these headphones perfect for travel.