CUTEDONKEY Seamless Portable Intelligent Air Purifier Active Carbon Air Filter Mask Electric Breathe Respirator Anti-Dust PM2.5 Wast Gas Spray Mask (blue) Technology Innovation-Patented, designed according to the human face for better seal.Has sloved the traditional mask's following problem: seal leakage, puncture, breathing obstruction, muggy, lack of oxygen and other difficult breathing Key Technology-Use the Europe hollow fiber ultra-filtration material and bacteria layer, anti-fine particles' efficiency is more than 90%; Power shortage intelligent alarm, ensure that it wouldn't bring uncomfortableness due to power shortage; Double and one-way outlet valve can reduce expiratory resistance; Two gears optional, 1st gear suit for walk, and 2nd gear for sports; The cotton liner is synthesized by super absorbent cotton and fiber, bring long & comfortable & dry experience Material Upgraded-This product materials comply with US FDA Food and Drug Administration Standards, it will be more health for skin, and no excessive gas and odor Creative Design-Its components are user friendly.Tightness degree can be adjusted freely, comfortable to wear Eco-friendly and energy saving-it's main body can be repeatedly used, only need replace filter material and accessories