Description Personal Air purifier positive pressure with 3 Layers protection. High quality air purifier device with 3 layers protection consist of 3M filter Charcoal filter HEPA. Protect from PM2.5 and Virus. Easy breath under the mask. Device can select 3 levels of fan speed with long hours use. Positive pressure with clean air pass 3 layers filter. Varies useful for many type of activities. Supplied fresh air respirator system is equipped with portable power sources mainly overcome the problems of big air intaking resistance, difficulties in breathing, and so on. Unique electronic ventilation design system, to keep the fresh air flowing through your nose and mouth, suitable for long time use. With filter function, 99.9% filter effect with Japan H13 high quality material filters. You can connect the electric air filter to anywhere you want，and then optionally tie to arms, neck, waist, and head. Continuous 500hours working by each filter element, adjustable wind speed, can be used for 8-10 hours with full charge, larger battery capacity, longer working time.