http://www.ebay.in/itm/Croma-3-5-mm...eadphone-for-Mobiles-MP3-Player-/200913833020 About the Product: Driver Unit: 16mm speaker Microphone: 3.0 X1.5mm/-62+3db Impedance: 32 Ohm +/- 15% at 1K HZ Sensitivity : 116db + 3db Frequency Range: 20Hz-20000Hz Max Power: 5mw