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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       Paper       0.2w       0.4w       25±15%Ω       Φ13.3mm       500±20%Hz               Fo-4kHz       83±3dB/W/M         Φ13×10(AlNiCo)       41g