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Products>>>Speaker>>>Telephone speaker       Diameter: Cone Material: Edge: Nominal Power: Maximum Power: Impedance:   Voice coil: Fo: Response: S.P.L: Magnet Size: Net weight:       Φ57mm       Paper       Paper       0.2w       0.4w       8±15%Ω       Φ13.3mm       400±20%Hz       Fo-4.5kHz       83±3dB/W/M       Φ12.5×1.5(NdFeB)       30.5g