For iRobot Roomba 600 700 800 900 SeriesClean brushes keep your home robot operating at peak performance.Side brushes are easy to remove and replace as part of routine maintenance.Replacement filters for iRobot Roomba and Roomba Professional Series Robots.Filters maintain Roomba's cleaning performance while reducing infiltration of dust, pollen and other allergens into the air you breathe.For best results, filters should be replaced every 2-3 months.Virtual navigation wall uses 2 * aa battery(Not included) with low battery indicator light, Effectively help you control the work scope of robotssize:11.6x4.4cmMaterial:ABScolour:BlackPackage Contents:2 * Virtual Navigation WallsOnly 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 +/- 1-3cm.