Original iRobot Roomba Combo motherboard. If your Combo has stopped working now you can repair it yourself and launch it again. It comes with everything you need circuits, sensors, motors, wheels, all included and already assembled.
iRobot Roomba Authentic Replacement Parts - Roomba Combo™ j Series
iRobot Roomba Combo j9+ review
Spare parts iRobot Roomba j series: j7, j7 Plus.
Roomba - Wikipedia
Roomba - Wikipedia
iRobot's Roomba Combo J7+ proves smart tech can be uncomplicated
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Spare parts and spare parts for Roomba Combo floor mopping robot
Roomba Combo J7+ Robot Vacuum Cleaner Main Side Brush Dust Bag