Product ID KWSP5070PN-G08/ 0.25E Rat.Impedance 4, 8, 16, 32, 64, 100, 150( ± 15% ) © Rat.Noise Power( Max) 0.25W Rat.Resonant Freq( fo) 450± 25% ( Hz) Rat.Freq.Range f° -3500Hz Rat.Char Sensitivity Level 86± 3dB D( mm) Ø 50 H( mm) 7.0