SANSUN headset SN-051MV- Stereo headphone 051M.V, loudspeakers Q 40mm,- Impedance: 32 Ohm, Sensibility : 103dB/mW- Frequencies: 20Hz-20.000Hz- Consumption: 100mw- Connection: 2.5m cable with 3.5mm plug- Microphone: 9X7mm from -58dB till +2dB