[Easy Installation] The side brushes are perfectly matched and the installation method is the same as the parts, which is easy to install, easy to use. [Hepa Filter] HEPA filter is made of high-strength environmental-friendly materials, which can block most of dust down to 0.3 micrometer. The filter can maintain the cleaning performance of the sweeper, while reducing the penetration of dust, pollen and other allergens into the air you breathe -Replacement Filter: A dirty filter greatly reduce suction power. Depending on the vacuuming frequency and amount of dirt cleaned, for best performance, change the filter at least every 3 to 6 months. [Excellent Performance] Our side brush's innovative structural design effectively prevents hair and other garbage from being entangled and enhances the ability to collect garbage. It can get deep in to corners and snug against walls and baseboard to an excellent clean area. Hepa Filter Compatible For Compatible For Alpha 2 Pro Robot Vacuum Cleaner