Dynamic 13mm receiver unit Sensitivity (S.P.L): 114dB ±3 dB at 1 kHz 180mV with IEC 318 coupler Impedance: 32 Ohm +/-15% at 1KHz Magnet Field Intensity: Axial dB , Radial –dB at 1KHz Nominal Input Power: 10mW Max. Input Power: Must be normal at a white noise, 20mW for 1 minute