HD Noise Cancelling Processor QN1 lets you listen without distractions Unique automatic personal NC, and Atmospheric Pressure optimisation Communicate without taking your headphones off. Place your hand over the housing to turn the volume down for instant conversation. With our new HD Noise Cancelling Processor QN1, noise cancelling power is greatly enhanced. Having a dedicated NC processor also ensures the reproduction of your music is never compromised due to processor performance. With a huge 30 hours of battery life, you'll have enough power for even long trips away. And if you need to charge in a hurry, you can get 5 hours' worth of charge after just 10 minutes with the optional AC adapter