HoldSound NCH-108 Active Noise Cancelling Headphones over-ears quiet headset with bass boost and mircophone for smartphone and with airplane jack (White) Eliminate unwanted noise by 85%, reduces ambient noise by up to 15dB at 300Hz. reduce the noise of the engine and other disturbing noises on planes, trains and buses. Ergonomics Design on Ear Pads' Bidirectional Rotating Shaft Structure: It's ear pads can tilt inward to adapt different shapes of skulls and faces better, which make it more comfortable and stable to wear. Humanized Mute Button: Press the mute button to stop music temporarily and have a short talk to people around you without removing the headset from your ears. High quality sound output: It uses sensitive polymer film diaphragm, which makes the sound details more rich and dense.It reduces the distortion of the music and let listeners get more pure music. It can present you the true sound of all kinds of music: Pop, Jezz, Rock, Drum, etc. Precise acoustic structure design, Strong and full bass effect Memory Resilient Sponge Ear Pads: The ear pads are made of durable and resilient sponge which is very soft and comfortable to wear.It uses the acoustic seal structure to present mega bass more outstandingly and improve your music experience.