Type: Ear-clip headset Item No.:M711MV Features: 1) Frequency Response: 20Hz-20kHz 2) Speaker Impedance: 32ohm 3) Driver Unit: 30mm 4) Rated Power: 20mW 5) Power Handling Capability: 30mW 6) Cable Length: 2.25M 7) Sensitivity:99+/-3dB 8) Microphone: 6?mm-58dB+/-3dB 9) Plug: 3.5mm, Microphone in Red, Earphone in Black