An army of robots working 7/7, 24/24 in a sorting centre of the transport company STO Express in Tianjin, China. Small Orange carts automatically identify each package through a QR Code and deposit it in the specified location, thus ensuring daily sorting of 200 000 deliveries through a huge warehouse. A ceaseless Broom of robots which intersect throughout the day without ever to hit, and when their battery starts to be exhausted, they will connect automatically to a charger. Thanks to this system, the STO Express company claims to have reduced its payroll by 70%.