eufy Robot Vacuum 3-in-1 E20 Accessories KitGreat Value Package: Rolling Brush & Brush Guard + High Performance Filter x2 + Side Brush x2 + Dust Bag x3. The products are made of high quality materials to ensure optimal performance and a healthier lifestyle. Compatible with eufy Robot Vacuum 3 in 1 E20. Replacement Frequency: Please clean the filter frequently. We recommend replacing the brush and filter every 2 3 months, also depending on the frequency of use, to keep the vacuum working at high