A staff member adjusts a non-contact self-service machine at the Anhui Easpeed Technology Co. in Hefei, east China's Anhui Province, March 9, 2020. A number of non-contact self-service machines and non-contact elevator buttons have been put into use in many hospitals and office buildings in the city to help reduce the risk of cross-infection in public areas. These devices, taking advantage of a kind of interactive holographic air cast imaging technology, can project elevator buttons and operation interface of self-service machines into the air to enable users to complete operation without touching the real objects. (Photo by Zhou Mu/Xinhua)

A staff member packs a non-contact self-service machine at the Anhui Easpeed Technology Co. in Hefei, east China's Anhui Province, March 9, 2020.  (Photo by Zhou Mu/Xinhua)

A staff member adjusts a non-contact self-service machine at the Anhui Easpeed Technology Co. in Hefei, east China's Anhui Province, March 9, 2020.  (Photo by Zhou Mu/Xinhua)

A person uses non-contact buttons to operate an elevator at the First Affiliated Hospital of University of Science and Technology of China in Hefei, east China's Anhui Province, March 9, 2020.(Photo by Zhou Mu/Xinhua)

A person uses non-contact buttons to operate an elevator at the First Affiliated Hospital of University of Science and Technology of China in Hefei, east China's Anhui Province, March 9, 2020. (Photo by Zhou Mu/Xinhua)

A patient uses a non-contact self-service machine at the First Affiliated Hospital of University of Science and Technology of China in Hefei, east China's Anhui Province, March 9, 2020. (Photo by Zhou Mu/Xinhua)