AKG K-490-NC - noise-cancelling, stereo headphones, active noise reduction, in-flight adapter, dynamic, closed, 117dB SPL, 20Hz-20.000Hz, 32 Ohms, 1.4m cable, stereo mini-jack connector, unique 3D axis folding mechanism, approx 40hr playing time with low battery warning. incl.in-flight adapter, carring pouch, USB charger cable, Suitable for mp3, MD, CD player and multimedia, requires AAA battery. Weight: approx 150g