1. : the use of electrostatic filter materials can effectively isolate particulate pollutants 0.2m in the air, and the dust filtration efficiency of 0.5m can reach more than 95%. 2. Extend the service life of the filter: effectively filter dust, pollen, and other pollutants in the air, the to reduce pollution. It can effectively extend the life of the purifier filter by more than double, thereby saving replacement costs. 3. service life: The -filter used in the of the finished product can effectively increase the service life of the filter, so your filter can truly reach the service life specified by the manufacturing . 4. Low wind resistance design: When the wind speed is 0.5m / s, the wind resistance is as low as 3.5pa, which does not affect the wind speed. 5. Compatible: This filter is compatible with Mi Air Purifier 1/2 / Plus, or cut it to a size suitable for air conditioners, windows, electric fans. 1. Filter , 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. Soft, non-toxic, odorless, washable 1 or 2 , not to rub hard. Range of use: Modified for household air conditioners, fans, air circulation fans, air conditioners, exhaust fans, fans, etc. size:Can be cut into at least 2 pieces of your purifier filter, one piece can be used for about , and can be tailored as needed (one can be divided into two for an air conditioner .) Two areas can be used. Colour:White Material:fiber Size:30x72cm Contents: 10* Electrostatic Filter Cotton Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.