3. In order to achieve the best cleaning and filtering effect, cleaning accessories should be replaced every 2-3 months according to the frequency of use. 2. Clean accessories keep your home robot at performance. Accessory contents are easily removed and replaced as part of routine maintenance. Also reduces the infiltration of dust, pollen and other into the air you breathe. 4. The HEPA filter can greatly improve the air quality and reduce particle size up to 99.97%. Helps remove household dust, pet dander, and more. 1. new, high-quality materials, well-made, , and highly matched with the equipment. 5. Say goodbye to odors, the pre-filter can help reduce unpleasant odors from pets, smoke, cooking fumes, and a variety of household products and chemicals.