China's ecommerce company Suning.com announced customers can make reservations for purchasing rapid antigen COVID-19 test kits online on Monday, as the country approved five rapid antigen tests for self-testing with thousands of new cases reported in the last week.

China has previously only used nucleic acid tests operated by professional medics to detect COVID-19 cases, but rapid antigen testing is very different. Here are the key things you need to know about it.