... GAI24 with Chinese police dep.PICC insurance.Stucture:Full face mask,Damand valve,Pressure reducer,Warning whistle,Pressure Gauge ... vision is specially wide, the comunication clear, sealing material soft, face window is used the polycarbonate material, it has strong anti ... spherical surface window, vison is wide, the clear communication, face widow is used the polycabonate material, it has strong anti ...