Digital noise cancelling : Industry leading Active Noise Cancellation (ANC) lends a personalized, virtually soundproof experience at any situation Hi-Res Audio : A built-in amplifier integrated in HD Noise Cancelling Processor QN1 realises the best-in-class signal-to-noise ratio and low distortion for portable devices. Driver Unit : Powerful 40-mm drivers with Liquid Crystal Polymer (LCP) diaphragms make the headphones perfect for handling heavy beats and can reproduce a full range of frequencies up to 40 kHz. Voice assistant : Alexa enabled (In-built) for voice access to music, information and more. Activate with a simple touch. Frequency response: 4 Hz-40,000 Hz