1.1 earpiece
Speaker:5290215mm
Impedance:32Ohm
Frequency response:20-20K hz
Sensitivity:108+/5db
2.Micphone Sensitivity:-52+/3dB
Direction:Omni-directional
Frequency response:100-100Khz
3.Cord length:75cm +/-5cm (the retracable cord lenthen )
4.Circle tray size(max):4cm x2.5cm
5.With on/off mute in earpiece