There is big diaphragm valve inside as the self-balancing system, automatically tracking users’ breathing actions, provide the on-demand supply and ensure that pressure inside the mask higher than external environment.

The square manual turnoff button in front of demand valve can turn off the demand valve against the outputting air flow to stop air supply. And it will automatically starts by the suction at inhalation.

·Streamline design with elegant appearance and no hindrance in vision.

·Manual turnoff valve easy to operate.

·Comfortable breath with little resistance.

·Simple operation and convenient use.

·Ensure large flow and safe air supply by using manual force air flux button.

·The shell adopts flame retardant and high-strength engineering plastics.

More detail pictures: