4WDKING Rechargeable Electrical Air Purifying, Reusable Portable Air Purifier with HEPA Filter for Sleeping Outdoor Sports Housework

* 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.