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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:       Φ50mm       Paper       Foam       1w       2w       4±15%Ω       Φ13.3mm         180±20%Hz       Fo-10kHz         79±3dB/W/M       Φ12.5×3(NdFeB)       30.5g