iRobot Roomba i7 TEARDOWN - Whats inside? How many motors? How to replace? Take apart - Disassemble - YouTube
iRobot Roomba® i7+ (7550) Wi-Fi® Connected Self-Emptying Robot Vacuum, Smart Mapping, Works with Google Home, Ideal for Pet Hair, Carpets, Hard Floors - Walmart.com
Roomba Maintenance Guide, according to Model Number
Replacement Kit Accessories for IRobot Roomba I7 I7 + /I7 Plus E5 E6 E7 Vacuum Cleaner Replacement Parts Maintenance Kit _ - AliExpress Mobile