電話機用受話器

 ITEMS. SPECIFICATIONS1TypeDynamic 31mm receiver unit2Sensitivity (S.P.L)92dB ±3 dB at 1kHz 60mV with IEC 318 coupler3Impedance.150 Ohm ±20% at 1KHz4Magnet Field Intensity.Axial – dB , Radial –dB at 1KHz5Nominal Input Power30 mW6Max. Input Power.Must be normal at a White noise , 50mW for 1 minute.7Total Harmonics DistortionMax 5 % at 1K Hz.8Operation temperature-30℃ to 70℃9Storage temperature-40℃ to 85℃10Weight.2.0g ±0.3g