The Dreame RHF20 is a specialized HEPA anti-allergen filter designed to maintain the air quality and performance of your robotic vacuum. It works by trapping fine particles, dust mites, and animal allergens, which prevents these small pollutants from being released back into your home's air during the cleaning process. This component is compatible with several high-end models, including the X50 Ultra, L50 Pro Ultra, L40s Pro Ultra, L50 Ultra, and L40s Ultra. Depending on the specific package version, you may receive one or two filters to ensure your device continues to operate efficiently over time.