The Circle Concerto Live-203 Headset is very nice headset.Its sound quality is amazing as well as sound strength is also good.It is available in market for 550-600 Rs. It is also having mike along with it It really give amazing experience to listen songs and while watching movies. its specification are as: driver is 40 mm driver of type NdFeB with impedance of 32 Sensitivity is 105 db S.p. at 1 KHz. Frequency Response 16Hz-20 KHz Power Capability 120 mW, 3.5 stereo microphone microphone unit 6*5mm senstivity -58+3db impedance 2.2 frequency response 3 Hz-16 khz standard operating voltage 3v. circle is concerto live-203 single pin headphone and if music is in your blood you become an fan of it.