Features: Accessories Kit for Xiaomi RoboVac T4 T6 S55 RoboVac S50 RoboVac S51 Robotic.(Please confirm the model number before purchasing). Please clean the filter frequently, and replace the brush, filter every 2-3 months to keep your vacuum cleaner working all the time in high-performance. Easy to install, no tools required. High-performance replacement for Xiaomi vacuum cleaner. Any problem, please contact our store without hesitation. Honor to serve you!