POS (point of sale), a sales terminal, is a multifunctional terminal. It can be installed in special merchants and acceptance outlets of credit cards, and connected with computers to realize automatic transfer of electronic funds. It has the functions of supporting consumption, pre-authorization, balance inquiry and transfer, and is safe, fast and reliable to use. At present, only the latest smart POS has a WIFI connection module, but most POS in the market only have telephone, network cable and flow card connections, and do not support WIFI connection for the time being.

Pos machine swiping credit cards has the following taboos:

1, not during shop hours, or don't swipe your card on weekends.

2, brush a lot of money at one time, resulting in a large number of overdrafts, which will attract the attention of bank credit.

3, for a period of time, multiple cards at the same time.