This noise cancelling aviation headphone employ an electronic circut to reduce the amnient noise and improve the audio reproduction quality to enhance your listening experience for high-quality. distoration-free music no matter how noisy the enviroment.it's foldable and compat design makes it idealfor the sonsumer for use in airplane or bus when travelling. Weight150g Speaker:40mm Impedance:40Om Frequency range:20-20,000Hz Sensitivity:112?db(1000Hz) Max.power:100Mw