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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       0.3w       0.5w       8±15%Ω       Φ13.3mm         400±20%Hz       Fo-4.5kHz       84±3dB/W/M       Φ13×10(AlNiCo)       43g