The JVC HA-NC250 is an extremely effective pair of noise-cancelling headphones, with up to 85% noise reduction with feedback technology, as well as Memory foam cushion and extremely smooth ear-pad surface that isolate background noise effectively. Use the HANC250 as a pair of normal headphones when the noise-cancel mode is turned off. Turn down the noise and listen. It's like hearing for the first time. The JVC HA-NC250’s noise cancellation circuitry includes feedback technology that constantly monitors the noise cancellation process.