This is a Roomba 870 purchased in 2018. As you can see, it's well-worn and covered in scratches. In addition, the scheduled cleaning function is broken, and it only cleans when the clean button in the center of the unit is pressed. However, it charges properly and returns to the charger without issue. Also, as shown in the picture of the underside, one of the side brushes is broken. It can still clean, but it would be better to replace it with a compatible brush. It doesn't have any smart features like Wi-Fi, app control, or mapping. It can only navigate using infrared guidance from the home charger and an old-fashioned algorithm, but it still cleans quite well. This Roomba still has working driving and dust collection functions, but the scheduling function is broken. It seems a shame to throw it away, so what do you think? The unit is 34cm in diameter and 9.5cm high. It's quite bulky, and the height can prevent it from going under chairs. We recommend measuring your space carefully before purchasing. ＜Included Accessories＞ Japanese instruction manual and charger (home base) are included. ※Replacement brushes, remote control, and virtual wall (infrared emitter) are not included.