There is a sound to active noise cancellation systems. Not really white noise, but a sort of faint, high-pitched noise.
It's not audible in airplane or other loud environemnts, but I never understood how you can work with that in your ears. Apparently some people doesn't find it irritating. But make sure to try someone else's before you spend hundreds on dollars on one for the office.
It's not audible in airplane or other loud environemnts, but I never understood how you can work with that in your ears. Apparently some people doesn't find it irritating. But make sure to try someone else's before you spend hundreds on dollars on one for the office.