The condom-in-a-can is essentially an antiseptic foam spray that the manufacturer claims forms a physical membrane inside the vagina, protecting it from infection, acting as a barrier to pregnancy and providing a lubricating effect.
It's not known who makes the NCC, but Beijing-based Chinese-Canadian condom maker Blue Cross Biomedical has been touting something along these lines for a while now. It maintains its spray-in condom "can effectively kill gynaecological disease pathogens such as staphylococcus aureus, Candida, coliform bacillus, and can prevent sexually transmitted diseases.