The filter filters fine dust to prevent dust, pollen and other allergens from entering the air you breathe. It is suggested to replace it every 2-3 months. Regular replacement of accessories will also improve the cleaning and suction performance of your sweeping robot. It can also help provide you with fresh air and a healthy living environment. Main purpose: The large capacity dust bag for M7 Pro M8 Pro robot vacuum cleaner can free your hands for a month and never have to worry about frequent replacement. Applicable models: for M7 Pro M8 Pro robot vacuum cleaner. Color: White Material: Plastic Package Contents: 10 * M7pro filters 15 * dust bag Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.