[Compatibility]Core 400S True HEPA Replacement Filter for Core 400S Smart WiFi Air Purifier. Compared to Part Core 400S -RF, LRF-C401S-WUS. [H13 Grade True HEPA]High-quality Core 400s-RF-PA HEPA filter removes 99.97% of airborne particles down to 0.3 microns. The Core 400s activated carbon layer is designed to remove unwanted gases caused by smoke, smog, food, pets, fuel, and more. [Value Pack]Includes 2 Core 400s True HEPA Replacement Filter Only. Replace your Core 400s Filter Every 6-8 months. [Easy to replace] Installation is easy, no tools are required. Simply remove and replace your filter unit when needed. Please replace the Core 400s filter . Color: White Material: composite material Package Contents: 2 x Air Purifiers 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.