Note: Not suitable for cell phone."K" Plug、 please get to know whether it is suitable for your device before ordering.Matching walkie-talkie type:Kenwood TH272G/372G、TK3130ProTalkSeries、TK313Free Talk series、TK220/320/240/208/360/370u2026etcFit for headphone: BF-5118u3001BF-5118Au3001BF-5180u3001BF6200u3001BF6800 TK-3107u3001TK-3207u3001TK-2107u3001TK-2207u3001TK-308u3001TK-208u3001TK-3118u3001TK-2118 TG-K4ATu3001TG-45ATu3001TG-46ATu3001TG-42ATu3001TG-3118u3001TG-6118 PX-777u3001VEV-3288Su3001LT-6600u3001LT-6288u3001LT-6100PLUSFeature:Air duct design principle、 is to prevent electromagnetic radiation. Sound through the air duct、 filter out the voice of the volume which is too strong and endanger human body health. So this one is no like other headphone wiht so loud sound. Long time wearing more comfortable、 ear won't pain、 and not easy to fall off. SpeakerSize: 15mmSensitivity: 102dB u00b1 2dB @ 1KzImpedance: 32u03a9Power: 5mWConnector:Life time:12000times(put in an take out)According to radio models、different connector availableMic:Dimension:6.0 x 2.7 mmSensitivity: -38dbImpedance: 2.2KRalated current: 100mAhPackage include:1 x Headsert Earphone1 x XSSML