... 5cmCarton Packaging:5 piece/CartonNegative ions:ozoen generator (ozoniser):1,Use high-quality enamel casting tube, the oxygen purity, stability, ... longe-lived; 2,Use epoxy resin, vacuum packaging high-voltage module, resistant to moisture ... reaction and does not change, can use for a long time, so that extended the use life of absorbent material. Cold catalyst ...