This is a Eufy Robovac with caries. The vacuum cleaner has recently started making an extremely loud noise. After investigating the cause, it turned out that the gear box for the brush on the front right side suffered from tooth loss. This Eufy RoboVac has been redesigned with new gears that are made from PETG to extend the product's shelf life. The vacuum cleaner has become more efficient and now also runs more smoothly.