? ?53mm driver with maximum aperture that is "SOLID BASS" series sound playback with sharp, deep and specially designed driver ?53 WS99. Well as low-frequency representation of depth and sharp, is expressed beautifully contours the mid and high ranges. ? By arranged (chamber) air chamber of the double structure in the case of housing low-pass play that is locked in a double air chamber mechanism that has evolved to increase the damping effect of the air, to play a low-pass with a tight . ? The driver unit can be mounted directly to the aluminum housing of the adoption of precision cutting with excellent acoustic properties eliminate unwanted vibration mounts directly to the driver precision cutting large diameter aluminum housing, eliminating unwanted vibration. I realize the playback sound with a sense of speed and depth. ? You can call on your smartphone and operation (play / pause music and video / story final answer /), ? 1 down the volume, volume adjustment does not require power ? 2 ? 1 comes with a microphone extension cord as possible. I will not be silenced even minimized. ? some smartphones 2 may not be able to operate the play / pause music and video. ? adopting the headband can be adjusted stepless stepless adjustment headband can freely adjust any position, according to the desired length is possible. / ? There is a case that does not work properly with some models. For applicable models, please check with the manufacturer page.