Xiaomi brings us this electric mask, rechargeable by USB and with the ability to purify the PM2.5 air up to 99%. Thanks to the nanofiber electret filtering system, the protection is extraordinary. It is also wind resistant and as long as it has a battery it will not stop filtering at any time, with a silent 3-speed turbofan. It is recharged by USB. Very comfortable, ergonomic and even allows you to run or exercise with it on. Minimum price from Spain!