Compatibility: Replacement filter (1-pack), compatible with E35 and S2. Color may vary due to different production batches. Washable and Reusable: Washable and reusable after air drying for long-term use. High-Performance: Captures 99.99% of particles as small as 5 microns, locking in fine dust and bacteria for cleaner air. Suggested Replacement: Replace every 3 months or after 90 hours of use. Genuine Anker eufy Accessory: To protect your robot vacuum and extend its lifespan, we recommend using genuine replacement parts. Third-party alternatives may not be compatible and may affect performance.