... , longe-lived.2,Use epoxy resin, vacuum packaging high-voltage module, resistant to moisture, earthquake, maintenance-free.3,Modular with plug ... air pump, longe-lived and good stability.5,Origin ABS engineering plastic, high hardness.6,3C certification standard power cord ... ,Two different colors of the trachea, easy to distinguish, more health.9,Small space, water, gas dual-use, simple operation, can ...