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. Users can also choose to turn off the noise-cancelling feature if they want to converse with another person. The headphones also feature a foldable design for easy storage and transport. Whether you are sitting on your desk at work or traveling on a plane, these headphones provide you a noise-free environment.