Respirator is a self-contained open air respirator, which is widely used in fire protection, chemical industry, shipping, petroleum, smelting, warehouse, laboratory, mining and other departments for firefighters or rescue personnel to safely and effectively extinguish fire, rescue, disaster relief and rescue in various environments such as smoke, toxic gas, steam or hypoxia. This series of products are equipped with a comprehensive cover with broad vision, bright and good air tightness. The air supply device is equipped with a new air supply valve with small volume, light weight and stable performance; Select high-strength back plate and high-quality high-pressure gas cylinder with high safety factor; The pressure reducing valve device is equipped with a residual gas alarm, which can send an audible signal to the wearer within the specified cylinder pressure range to remind the user to evacuate the site in time