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iRobot's limited warranty covers the robot, including the battery and base station, for a period of one year. It gets pretty loud—around 88db, or about the same volume as a leaf blower—for about 15 seconds as it sucks all the debris from the robot's bin into the dust bag.

We tested the floor cleaner’s prowess by setting the robot to work both with and without the solution, then wiping the space around the hob and kitchen sink with a paper towel to check for residual mess. The robot has an optional floor washing system using a washable microfiber cleaning cloth and a cleaning cloth plate attached to a proprietary tank.

The Combo j7+ is also equipped with a suite of sensors for navigation and environment recognition, including six cliff sensors that prevent it from falling down the stairs, and acoustic sensors that listen to the echo of sound to differentiate hard flooring from carpet. Unlike most competitors, iRobot doesn't specify the pascal (Pa) suction power of its robot vacuums, but says the Combo j7+ is 10 times stronger than its entry-level Roomba 600 series.

It also runs across the room in methodical straight lines but, unlike the mop, it uses its ‘dirt detect’ technology to spot grimier areas and clean them more thoroughly. In vacuum and mop mode, you can select the liquid amount: eco (light), standard (medium, the default option), and ultra (heavy).