High quality Replacement Filter, 1 Pack Fully Compatible with Mod Air Purifier (Model MD01, MD02) *NOTE: This is not an OEM product. Any use of the brand name or model designation for this product is made solely for purposes of demonstrating compatibility. 3-in-1 Filtration System with Pre-Filter, Efficiency Filter, and High-Efficiency Activated Carbon Filter High-efficiency filtration layer improves air quality and promotes your health, can filter airborne such as smoke pollen dander hair smell. Activated Carbon Filter absorbs household odors from pets, cooking, smoking, wildfire... It is recommended to replace it every 6-12 months depending on usage and environment Air Filter Replacement Compatible with Mod/Mod+ Air Purifier, High Efficiency 3-in-1 Replacement Filter, 1 Pack