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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       0.25w       0.5w       50±15%Ω       Φ13.3mm       450±20%Hz         Fo-4.0kHz                 82±3dB/W/M       Φ32×Φ18×6(Ferrite)       52.5g