The Headphone is designed for the serious audiophile to provide an ultimate experience in sound reproduction. It is used in various devices such as for iPod, tablets computers, field recorders, smartphones, and more. This headphone features a frequency response of 20Hz to 20 kHz. It uses dual balanced-armature drivers in conjunction with a 3-way crossover to provide another level in the listening experience. It features 40dB passive noise attenuation to suppress outside noise