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Model: K20 Color: Black, Camouflage White, Camouflage Grey Speaker Diameter: 40mm/1.57" Frequency Range: 20-20KHz Sensitivity: 118±3dB Impedance: 32?±15% Microphone Diameter: 6.0 X 5.0mm/0.24 X 0.2" Microphone Sensitivity: -38±3dB Microphone Impedance: 2.2K?