Enjoy great quality audio undisturbed by outside noise with the Koss BT740iQZ Wireless Bluetooth Noise-Cancelling Headphones. These elegant and well-crafted headphones are perfect for your music, podcasts and phone calls.You can pick out exactly how much of the outside world to let in. Three levels of noise-cancelling means you can listen out for your train annoucement, or completely relax with just your music.Keep the Koss BT740iQZ on as long as you want. The soft padded earcups and adjustable headband fit comfortably on your head, while the built-in battery gives you around 30 hours of playtime.There are on-ear controls to adjust volume, pause music, and answer calls, so you never need to reach for your phone. And if you prefer a wired connection, there's a detachable audio cable.