The robot vacuum cleaner is a great thing for the home, especially for busy people who have little time for cleaning. Therefore, the roborock E-4 vacuum cleaner is a godsend, with it you can calculate the cleaning time and set the cleaning day, another very convenient function, control from your smartphone. on a business trip, you don’t have to worry about cleaning. I recommend it. And I also received a sanitizer as a gift when I bought it.