商場RFID防盜設備

I need a system that I can use for retail application. Products should
be coded as they enter the shop and decoded at the till point when a
payment is made by the customer. If any product leaves the shop
before it is decoded at the till, there should be a RFID detector at
the exit door which should alert security personnel. The system Should
be able to link with Point of Sale System of the shop.