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One card made the service close and hominize. It is suitable for medium and large scale hotel ,extraordinary which in a complex district. It is a room card. It is a credit card.You do not pay your bill until you leave hotel.It will solve the problem that you may charge with coins. It is also a GPRS。It can help you to find the way to get back to hotel.
Yongzhan LIU ,YinHu
Zhen LEI, Aolin PEI