This earpiece is compatible with all Remote Speaker Microphones with a 3.5 mm audio jack on the head of the microphone. UL certified TIA 4950 approved when used with a UL certified TIA 4950 approved APX 4000 two knob radio
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Replacement speaker microphone coil cord for HMN4101 and HMN4104. Radio compatibility includes the APX900, APX3000, APX4000, APX6000, APX7000 and APX8000. Physical Characteristics: Weight (lb): 0.25 Dimensions (inches): 20 H X 0.25 W X 2.25 L
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