In-ear 9mm high definition headphone with passive noise isolation. Features crisp highs with balanced bass and mids for the discriminating listener; Works with iPhone, iPod, MP3,CD, DVD, PSP and computers; Wooden housing for crisp, accurate music reproduction; Passive noise cancellation minimizes ambient sounds; Ultra lightweight design with PVC-free, tangle-resistant cable; Dynamic driver features 20Hz to 20kHz frequency response; 3.5mm gold plated plug for increased sound clarity; Four sized flexible silicon ear inserts for secure fit (s/m/l/xl); Cord clip and cotton carrying pouch included.