If you fly you know that aircraft cockpits are a noisy environment. There is no such thing as a quiet cockpit.
Aircraft noise can lead to stress, manifesting itself in a lack of concentration.
This is especially dangerous in aircraft cockpits, where the highest standards are required for passenger safety. Sennheiser developed a line of active noise cancellation headsets with models designed to reduce noise levels to a comfortable and safe level in aircraft cockpits of all types and noise levels. This active noise cancellation system operates on the principle that noise becomes anti-noise when its phase is inverted by 180 degrees. As a result, noise and electronically produced anti-noise cancel each other out. A lightweight supraural closed cup headset designed to actively reduce cockpit noise.