With the Dreame Maintenance Kit RAK80, your robot vacuum lasts longer. This kit includes all the parts you need for regular maintenance. You replace the parts every 3 to 6 months. How often you do this depends on how often you use it. The main brush sweeps dirt into the suction brush. The side brushes remove dirt and dust from corners and along edges. The 2 filters keep dust particles out of your home better. The 3 sets of mopping pads keep your floors fresh and clean. With all these accessories, your robot works hygienically and you don't have to buy the parts separately. You can use the maintenance kit with the L10s Ultra Gen3, D30 Ultra, and L40 Ultra AE.