SoundMagic PL21 Headphone Earphone Rs.589 Frequency range15~22000Hz Sensitivity972dB at1KHz/mW Unit:9mm Neodymium Magnet Model No.L21 Noise isolation near -20dB. Super bass response and outstanding clarity. Comfortable,sound-isolating ear-tips reduce noise. http://www.snapdeal.com/product/soundmagic-pl21/61629#bcrumbLabelId:288