With the ECOVACS OZMO Roller mop, you can replace the worn roller of your robot vacuum. This lets your robot scrub stains off your floor. If you replace the roller mop every 90 days, the cleaning performance stays good and your robot lasts longer. Thanks to the click system, you can replace the roller mop without effort. You can use the roller mop with your ECOVACS X12 or T90 robot vacuum.