Feature:1PCS Primary filter for ILIFE A4/A4S/A6 Robot vacuum cleaner For i LIFE A4 A4s Robot vacuum, Dust Bin Filter. Replace the filter once per month or twice for high performance, depending on your usage. To replace Filter Net, follow these steps: 1. Take out the dirt bin.2. Remove the filter on the dirt bin & throw it away.3. Put a new filter into the dirt bin.4. Put the dirt bin back into its slot on top of the robot. Package inclued: 1 x Filter Net