【FULLY COMPATIBLE WITH LEVOIT CORE 400S】This premium Core 400S replacement filter is specifically designed to fit LEVOIT Core 400S Smart WiFi Air Purifier. Compared to Model: Core 400S-RF (LRF-C401S-WUS). Keep your Core 400S air purifie r at its best working efficiency and capacity, breathing fresher and cleaner air all the time. 【Multi-Stage Filter】Our Core 400S-RF replacement filter is made of upgrade main filter activated carbon filter, and fine Nylon Pre-Filter material, which effectively attaches a wide variety of airborne contaminants as small as 0.3 microns and absorbs unwanted odors. 【IDEAL for HOUSEHOLDS WITH PETS】Our Core 400S-RF replacement filter is made of high-efficiency activated carbon filte r absorbs your home of unwanted household odors, smoke, fumes, and VOC-s, it's a good choice for animal lovers or smokers, to improve your home air quality. 【COST-EFFECTIVE PACKAGE】Package includes 2 packs of Core 400S-RF replacement filter, easy to install. It is recommended to replace every 6–8 months depending on the air quality in your area and the use of the Air Purifie r to ensure optimal performance. 【BUY WITH CONFIDIENCE】 Cabiclean has been committed to providing all customers with high-quality and cost-effective air purifier filter, and helping customers build a better living environment. We provide a 90-day warranty or refund for each customer, we value each customer, and our after-sales team will provide each customer with satisfactory service. Filter made of FSC-Certified paper 2 Pack Core 400S Replacement Filter for LEVOIT Core 400S Smart WiFi Air Purifier, Core 400S-RF Activated Carbon Filter, LRF-C401S-WUS, White