http://www.amazon.in/Panasonic-RP-HX250ME-RP-HX250M-Stereo-Headphones/dp/B00K8694NA Driver Unit : 32mm Frequency Response: 9Hz-25KHz Impedence: 24ohm Microphone: Yes PC:- 999 @ https://www.headphonezone.in/products/panasonic-rp-hx250m