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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       50±15%Ω       Φ13.3mm       300±20%Hz       Fo-5kHz                 85±3dB/W/M       Φ39×Φ19×6( Ferrite)       82.5g