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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       25±15%Ω       Φ13.3mm       400±20%Hz       Fo-4.5kHz       83±3dB/W/M       Φ12×2(NdFeB)       34g