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Zeng Wei, a 26-year-old bank teller in Beijing, developed a new habit last year. Before he goes to work every morning, he turns on his robot vacuum, which will automatically clean his 30-square-meter living room.

"It works beyond my expectations. The smart vacuum cleaner can not only pick up debris under the sofa, but also map the best routes to do cleaning," Zeng said. "It is not a toy, but a real helping hand."