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Hoco Earphones M1 Benefits- Speaker: 14 mm.- Impedance: 32 +/- 15%.- Frequency of response: 20 ~ 20000Hz.- Sensitivity: 116 dB +/- 3 dB.- Audio plug: 3.5 mm.- Earpiece line: TPE high-elastic line with enameled wire.- Microphone: equipped.- Wire control: compatible with mainstream apple and android phones, with exquisite workmanship.