1. Innovative technology: the use of electrostatic filter materials can effectively isolate dust pollutants larger than 0.2 mu;m in the air, and the filtration efficiency of 0.5 mu;m dust can reach more than 95%.2. Extend filter life: effectively filter dust, pollen, bacteria and other pollutants in the air, protect filters to reduce pollution. It can effectively extend the life of the purification filter by more than twice, thus saving replacement costs.3. Improve service life: The pre-filter used in finished product filters can effectively extend the life of the filter, so that your filter can truly achieve the service life specified by the production trademark.4. Low wind resistance design: when the wind speed is 0.5m/s, the air resistance is only 3.5pa, which does not affect the wind speed.5. Compatible: This filter is compatible with Xiaomi Mi Air Purifier 1/2/Plus or cut it to a size suitable for air conditioners, windows, electric fans.1. Filter soot, PM2, 5 etc.2. Used in conjunction with the HEPA filter, placed in front of the HEPA filter, can effectively extend the life of the HEPA filter. Soft, non-toxic, odorless, washable 1 or 2 times, remember not to rub hard. Scope of application: modified air purifiers for home air conditioners, fans , air circulation fans, air conditioners, exhaust fans, fans, etc. Size: can be cut into at least 2 pieces of purification filter, one piece can be used for about 1 month, and can be adjusted as needed (one can be divided into two for the hook air conditioner). Two areas can be used. Color: white Material: fiber Size: 30 x 72 cm Package content: 50 x electrostatic filter cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.