Managed by the computer, Purchase electricity first then consumption
Consumption following the limit of rated current of the meters (Defined by the electricity sector)
A card following a meter, define cards for specifically application, purchased power still can be used once card lost (need to buy new card).
With cards data transfer will be bi-directional.
Alerts users to purchase electric power; if no power, will wind up power, same time with software design of anti-theft.
The meters are for indoors application, ambient temperature shall not exceed -20 ~ +55 C, relative humidity less than 85%, and the air shall not contain corrosive gases and avoid the impact of dust and sand, fungi, and inspects etc.