Description: Xiaomi Eco-chain Purely launched a new anti-pollution air mask. Effective block the dust and pm2.5 outside. Main Features: Comes from Xiaomi Eco-chain Anti-Dust Cotton Women Men Muffle Face Mouth Masks with Food-grade PC material Designed for meeting different demands on various conditions and relieving the suffocating feelings Nano-fiber electret filtering technology, the air filter is apparently able to achieve PM2.5 filtration efficiency of up to 99 percent you can adjust the fan speed by a button with 3 adjustable modes. Quiet and ultra-thin fan, the mask is safe and comfortable to wear Compact appearance, and lightweight design, a perfect gift for outdoor sports Specification: Brand: XiaoMi Color: Gray Material: PC,PP Feature: Breathable,Windproof Rated voltage: DC 5V Rated power: 0.4W Battery: 500mAh rechargeable lithium-ion battery Battery service time: 4 - 8 hours Weight: 50.5g Size (L x W x H): 7.50 x 3.70 x 1.25 cm / 2.95'' x 1.46'' x 0.49'' Note: Please allow minor deviation due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included: 1 x Xiaomi Air Mask 1 x Mask Filter 5 x 26mm Purely Filter 1 x Spare Mask Cap