規(guī)格：Material, Construction Plastic “NORYL® N-190”, Flame Retardant UL 94-VO, Black (Case), Audio-Oscillator and Piezoelectric Driver (Internal Circuit), 2 Parts Epoxy Resin or Silicone, Black (Potting), Stainless Steel 304 (Diaphragm), 0.062 " Thick, 60 Durometer Neoprene Gask,
