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.