Brand Name: Xiaomi Mask is made out of a multilayered high-fiber material. On the right side, it wears a unit, consisting of a filter and a fan. A replaceable filter detects pollutants with a diameter of 2.5 µm not giving them a chance to get into your lungs. The fan can be manually turned on / off and offers three modes of speed It is supported by the rechargeable battery that can last up to 4–8hours on a single charge. Then it can be topped up with Mi Power Bank or other means through microUSB port.