General description Clean brushes keep your Dreame H11 MAX Electric Floor Household Wireless Vacuum Cleaner operating at peak performance. The side brushes are easy to remove and replace as part of routine maintenance. The filters maintain cleaning performance while reducing the infiltration of dust, pollen, and other allergens into the air you breathe. For best results, filters should be replaced every 2 to 3 months. Technical specifications Compatible Models: H11, H11 Max Material: Plastic Package Contents: 2 x Roller Brushes, 4 x HEPA Filters Measurement allowed error: +/- 1-3 cm