ATH-ANC27x QuietPoint® active noise-cancelling over-ear headphones offer an outstanding combination of performance, value, comfort and portability. The headphones provide up to 85% noise reduction, and deliver exceptional sound quality with powerful bass, a natural midrange, detailed treble and precise imaging in an immersive soundfield. A detachable cord enables their use as cord-free noise-cancelling headphones. The headphones feature cushioned ear pads and a padded adjustable headband for total comfort even during extended wearing. The ATH-ANC27x is ideal for use with portable music and DVD players, in-flight entertainment systems, laptop and desktop computers and many other devices, and is compatible with the Apple® iPod®, iPhone™ and iPod touch®. The audio functions even if the battery runs down.