Active Noise Cancellation: Headphones Bluetooth wireless noise cancelling with cushioned ear pads covers your ear, blocking more than 90% of external noise and quickly creating a quiet environment. Combining active and passive noise cancellation, Bluetooth headphones dramatically eliminate low & mid-frequency noise from airlines, car engines, commutes and other annoying background noises. Enjoy your private concerts or audiobooks freely without the influence of extraneous sounds. Note: Wired mode has no ANC function