The only distinction between these two models is that the j7+ has an auto-emptying feature, while the j7 does not.
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iRobot Roomba J7+: Avoids pet mess and more
With New Roomba j7, iRobot Wants to Understand Our Homes - IEEE Spectrum
iRobot Roomba j7 (7150) Wi-Fi Connected Robot Vacuum - Identifies and avoids Obstacles Like pet Waste & Cords, Smart Mapping, Works with Alexa, Ideal for Pet Hair, Carpets, Hard Floors, Roomba
iRobot Roomba J7+: Avoids pet mess and more
CLEANS WHEN & WHERE YOU WANT– Only iRobot brings you Imprint Smart Mapping allowing you to control & schedule which rooms are cleaned and when, while
iRobot Roomba j7 (7150) Wi-Fi Connected Robot Vacuum - Identifies and avoids Obstacles Like pet Waste & Cords, Smart Mapping, Works with Alexa, Ideal
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iRobot Roomba® j7 Series Robot Vacuums, iRobot®