There are many people and the space is relatively closed, such as teaching building hall, library hall, downstairs dormitory, playground, hospital consultation hall, factory, station waiting room and so on.
Places with open space but large population flow, such as tourist attractions, outdoor squares and so on.
There is generally no problem in these places mentioned above, but vending machines must be intelligent, that is, vending machines that support mobile phone code scanning and remote monitoring and management. One person can manage multiple vending machines at the same time through the network, which is more convenient to replenish goods regularly according to background data.