Even in public or noisy indoor environments, the QuietComfort 45 Noise-Canceling Wireless Over-Ear Headphones can deliver a private audio experience. Utilizing active noise cancellation, internal microphones monitor sound at your ears while external mics pick up ambient sound. Whether it's music, podcasts, a movie, or absolute silence, the QuietComfort 45 will know what you want to hear, and create a sound wave for the rest of the noise to cancel it out. A quad mic system gives you similar noise reduction during calls and the built-in battery can last for up to 24 hours before needing to be recharged or converted to a pair of wired headphones with the included AUX cable.