Filter Compatible with HSP001 Air Purifier: This air purifier replacement filter for Smart Air Purifier HSP001. 4-Stage Filtration: This HSP001 composite filter efficiently traps 99.97% airborne particles larger than 0.3 , which includes smoke, odors, dust, dander and pet fur. By using this filter, you can breathe easy and enjoy a healthier living environment. Filter Life: To keep your air purifier working efficiently, it is advisable to change the filters every 4-6 months. By doing so, you will that the system is working at its best and providing you with all year round. Changing the filters at regular intervals is a cost-effective way to maintain the system and save money in the long run. Color: Blue Material: composite material Package Contents: 1 x High-efficiency HE-PA Filter 1 x Activated Carbon Filter 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 allowed error is +/- 1-3cm.