ELEGIANT 2 Pin Cool FBI Style Headset Earphone for Kenwood Walkie Talkie 2 Pin Cool FBI Style Headset Earpiece for Kenwood Walkie Talkie Air duct design principle to prevent electromagnetic radiation It is comfortabl while taking Long time wearing Not easy to fall off. Speaker Size:15mm Speaker Sensitivity:102dB plusmn: 2dB 1kz.Speaker Impedance: 32 Speaker Power: 5mW Connector Life time : 12000times(put in an take out) Mic Dimension : 6.0 x 2.7 mm Mic Sensitivity : -38db Impedance : 2.2K Ralated current : 100mAh