Roomba® 900 series uses iAdapt® 2.0 Responsive Navigation with Visual Localization to ensure complete home coverage (up to >2000 ft² / 185 m²). Roomba® divides your home into regions, and may leave an area or room before it completes cleaning. It will know where it left off and return to resume cleaning.
When Roomba® senses that its battery is low, it will return to its Home Base® to recharge. If there is more cleaning left to do, Roomba® will automatically continue its cleaning job after 90 minutes of charging. When Roomba® is charging in the middle of a cleaning job, the CLEAN button will be pulsing when it is on the Home Base®, and the iRobot® HOME App will indicate that the cleaning job is paused.
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Ensure the house has adequate light for the robot to navigate. Dark rooms can be challenging for the iAdapt® localization camera, and can cause problems with navigation and coverage. Daylight or dim lighting is sufficient for Roomba® to navigate effectively.
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Wipe the clear window on the robot's top surface using a microfiber or soft cotton cloth that has been lightly dampened with water or a screen cleaning solution.
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Turn the Roomba® over and use a clean, dry microfiber or soft cotton cloth to wipe any debris that has accumulated in the round iAdapt® Floor Tracking Sensor opening on the right side of the robot's bottom surface. Do not spray cleaning solution directly into the sensor opening.
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If Edge Clean is deactivated, Roomba may not cover your entire floor. To change the setting, open the iRobot® HOME App and select 
Cleaning Preferences ➔ Edge Clean and then toggle Edge Clean on or off.
Note:The default is set to one-pass coverage. To toggle the number passes, use the iRobot® HOME App and select Cleaning Preferences.
Automatic cleaning preference is available with the following software versions:
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iRobot HOME App: 1.5.1 or later.
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Robot Software: 1.6.6 or later. To check the robot's software, open the iRobot® HOME App and select 
More ➔ 
Settings ➔ About (robot name). Roomba® will automatically update its software if a new version is available when it's connected to your Wi-Fi network and is on the Home Base®.
