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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:       Φ66mm       Paper       Paper       0.5w       1.0w       4±15%Ω       Φ13.3mm       350±20%Hz       Fo-4.5kHz       82±3dB/W/M       Φ12×2(NdFeB)       31.5g