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