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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:       Φ77mm       Paper       Paper       0.5w       1.0w       8±15%Ω       Φ13.3mm       350±20%Hz       Fo-4.5kHz       84±3dB/W/M       Φ12×72( NdFeB)       40g