1. Portable filtration unit, EPA H13 filters PM2.5 by 99.9%, effectively blocking dust particles, toxic fumes, virus and bacteria, pollen, smoke 2. Adjustable fan speed, An axial flow fan runs at 1650 RPM, with 2 levels of air flow. An innovative honeycomb design increases air intake and reduces resistance. The spiral-widening air duct design for more smooth and efficient airflow 3.The filtration unit has 3 fan speeds with options of 2.35, 1.77, and 1.18 CFM, depending on the level of activity and air flow desired continuous stream of fresh air resolves the problem of stuffiness in regular masks 4. The outer rim of the mask fits tightly but comfortably to the face and prevents any outside pollutant from entering. Adjustable nose clips on the mask also ensures users are comfortable wearing the mask. However, any other mask can be used with the AirPro Mask filtration unit by following the instructions in the package. 5. Compact and lightweight, The air pump is rechargeable and can be worn on the arm, neck, or helmet. The filtration unit is also specifically designed to be light and easy to carry for everyday usage. 6. Long filter life, The filter element can be used up to 500 hours; the filtration unit can be charged through a USB port. 7. This Air-Purifying Respirator has CE, FCC, ROSH Certified and is FDA registered. tested to filter bacteria by a 99.39%