Advanced Active Noise Cancelling Technology : Kimitech headphones selectively eliminate 99% inappropriate and unpleasant noises from airplane operation, urban traffic, public places and so on, ensuring you to enjoy your quiet music and call whenever and wherever, especially suitable for travel and work. Patent Design of Deliver Deep Bass: Patent technology to enhance the bass and high quality 40mm drivers unit to deliver the sound that you want to hear. Sweet high pitch, stereo alto voice, deep bass response, in a word, is thorough .share the stereo sound with your friends, kids, lovers via Kimitech Active noise reduce headphone's at 20Hz-20KHz frequency range. Keep you Stay Wearing Comfortable: The Memory-protein ear cushion simulate human skin texture, ensuring lasting comfort. The stainless steel slider and softly padded headband allows you to find the perfect fit without constraint and provide excellent durability.