Locked4Kids consists of a carton and a plastic tray that holds the product, e.g. medicines in blister strips. To access the product, the tray should be pulled out like a drawer. To secure child safety this only works if two hooks on the top of the carton are pressed simultaneously. Looking closely at the Locked4Kids carton, you will find two push points with hooks sticking out. These push points are located diagonally across each side of the carton. And that’s why children have difficulties opening the cartons. They simply don’t understand how it works. And if they do, they are not able to handle it physically because their hands are too small.