Mi Robot Vacuum Cleaner models makes you confused?
Big comparison: Mi Robot Vacuum vs Mi Robot Vacuum 1S vs Roborock S5 vs Mi Robot Vacuum 2 - Xiaomi Planet
Amazon.com - Compatible with Xiaomi Mijia 1s 1st SDJQR01RR SDJQR02RR SDJQR03RR Robot Vacuum Cleaner Left and Right Wheel Replacement Accessories (Color : L 1pcs) -