Noise Cancelling Headphones shut out external noise so you can enjoy your favorite music tracks in peace. They can also create a tranquil environment so you can take a quick nap during your office break. They block out annoying background noise from cars, buses, trains, airplane engines, air conditioners and surrounding people. By generating an out-of-phase signal, they are able to reduce unwanted ambient sounds. What is amazing is that a single AAA battery is all you will need to produce the out-of-phase signal. One can always opt to switch off the noise-cancelling feature anytime they need to converse with another person. The headphones are also designed to be foldable for storage and travel. Whether you are at home, at your office or on the move, these headphones can give you a peaceful listening experience.