Noise-canceling headphones create a quiet environment for work, sleep, or listening pleasure. Built-in microprocessor analyzes background noise to generate inverse sound waves that cancel offending sounds. Engines, fans, snoring and other low-frequency annoyances virtually disappear, leaving you free to work, sleep or listen to music in blissful silence. Comfortable, lightweight, foldable design stows in travel bag for carrying case. Headphones include an airplane jack for hassle-free music or movie enjoyment, a 5' long cord and AAA battery.