Xiaomi launched a new anti-pollution air mask. Featuring a three-dimensional structure, and rechargeable and detachable air filter, the mask is lightweight and portable, weighing 50.5g. The Mi Purely Anti Pollution Mask features nano-fiber electret filtering technology, the air filter is apparently able to achieve PM2.5 filtration efficiency of up to 99 percent. Three adjustable modes, the mask has a thin fan with 3 speeds, and you can adjust the fan speed by a button, which is designed for meeting different demands on various conditions and relieving the suffocating feelings. Food-grade PC material, quiet and ultra-thin fan, the mask is safe and comfortable to wear. Three-dimensional structure, compact appearance, and lightweight design. A perfect gift for outdoor sports. It has no warranty.