This kit includes everything you need to maintain your air purifier: 1 Medium Filter, 1 HEPA Filter, 1 Charcoal Based AC Filter, and 1 Custom Filter (Germ Defense, Toxin Absorber, Pet Allergy, or Odor Remover). Filters should be changed every 1-2 years depending on usage. For Rabbit Air MinusA2 Models SPA-700A and SPA-780A