Replaced by another background noise

These headphones can be used in two modes: with or without noise cancellation. There is a switch to turn the noise suppression. The article comes with an integrated battery (not replaceable) and is loaded with a USB cable to any computer.

The noise suppression is really about the background noise ("white noise"): machinery, aircraft, rustling. When we light the deletion, these sounds are replaced by a thin hum (like an enclosure which is lit without input). By cons, other noise (horn, voice, barking) is not reduced. As for noise, the headphones are useless.

So I think the promise "noise suppression" requires clarification.