A useful item to have on hand. This is a very clever piece of technology; the subtleties do not bother me in the least, thus I do not consider them to be flaws. Although there is a possibility that an impediment will show up on his map today, it is unlikely that he will remove it the following day. Instead, he will continue to pass through the same area, but only for the third or fourth time. The map is occasionally messed up by mirrors, and if it encounters an obstacle or undergoes a sudden change in orientation when hitting or jumping, it may become disoriented, start sketching extra chambers, and eventually become completely lost. You will need to maneuver the card after you have dragged it to the docking station. There are also nuances associated with the fact that it is written entirely in Chinese. You need the China region and the English language included in the application; otherwise, it will not be added to the devices, at which point you will be required to know the hieroglyphs. There are ways to get around these challenges that can be found on the internet, but I have not been successful in using them. Also on the internet, on a well-known forum with gadgets, there are a lot of tips for everyday use with maximum efficiency at minimal cost. It will be useful to know these tips both before and after making a purchase of the product in question. A significant query for the retailer: it seems to be brand new, but the fact that the package has been opened reveals an embarrassing amount of condensation in the tank. As a consequence of this, the score is a 4. If the vacuum cleaner has been refurbished or is only lightly used, then the price is not low; the price is exactly the same in other online stores or sites, and sometimes it comes across as even cheaper. This means that the vacuum cleaner is not cheap. I turned a blind eye to this because there were no contact marks on the bumper or lidar, and also because the wheels, brushes, and filter were flawless; however, buyers should exercise caution when making purchases.