100% Original and Goo d Quality with Free After-sale Warranty . The use of electrostatic filter material, can effectively isolate the air greater than 0.2m particulate pollutants, the dust filter efficiency of 0.5m can reach more than 95%.Effective filter dust in the air, pollen, bacteria and other pollutants, protect the filter s less pollution. It can effectively extend the life of the purifier filter more than 1 times, saving replacement costs.The pre filter sn used for the filter s of the finished purifier can effectively increase the service life of the filter sn, so that your filter sn can truly reach the service life marked by the manufacturer.When the wind speed of 0.5m / s, wind resistance as low as 3.5pa, does not affect the wind speed.This filter is compatible with Xiaomi Mi air purifier 1/2 / Plus, or cut it into the appropriate size for air conditioners, windows, electric fans.1. Filter soot, PM2.5, etc.2. Used in conjunction with the HEPA filter, placed on the front of the HEPA filter, can effectively extend the life of the HEPA filter.White, soft, non-toxic, odorless, washable 1 or 2 times, remember not to rub hard.Range of use:Modified air purifiers for household air conditioners, fans, air circulation fans, air conditioners, exhaust fans, fans, etc.colour:whiteMaterial:cottonPackage Contents:4 * Filter cottonOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.