After about six months of work, he began to act up, demanding to wipe the fall sensor. We contacted the seller of the goods, which he recommended to send to the Mixtech service center in Hong Kong. After staying in the capital, a month later the robot vacuum cleaner returned back with the same drawback, but without sealing after opening at the service center. They recommended sending it to the Mixtech service center, but already to the department located in our city (the first time it was absolutely impossible to do this). Currently working with sin in half. I do not advise you to purchase. It is better to take well-recommended brands.