Speaker size：40mm Impedance：30ohm Frequency：20 HZ---20k Hz SPL：113dB Voltage：20MW Maximum Output Microphone size：6 x 2.7mm Feature：omnidirectional Frequency：100---10k Hz Vibrator SPL：-45dB Voltage：2.5---5V Vibrator and other parts Size：30mm Cable length: Approx. 2.0 M brush finished cable Type: over-the-ear