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The bar code of the same product in the supermarket is the same, so when you buy multiple pieces of the same product in the supermarket, the cashier only needs to take care of it. Then why wouldn't the other unilluminated products cause the security door alarm? 
The composition of the supermarket security door system:
(1) Inspection door: consists of a transmitter and a receiver, with a width of 0.9-1.5 meters.
(2) Decoder board: Placed on the cash register to disable the electronic soft label so that the label does not cause an alarm when the door is checked.
(3) Electronic soft labels: affixed to small-sized, valuable, easily stolen merchandise.
(4) Hard tags: Can be used repeatedly, suitable for clothes, shoes, knitwear, etc.
(5) Hard Tag Device: Solve the hard tag at the cash register.
Supermarket security door system compared with closed-circuit television system, the superiority of supermarket anti-theft system is very obvious:
(1) High efficiency. The electronic anti-theft system seizes him on the spot when the thief walks out, which has a huge deterrent effect on theft. Even if the inspector observes the behavior of hiding the goods, he only has to wait until he leaves home to search. Checking and tracking time is not always effective.
(2) Manpower saving. Closed-circuit television systems require several people to stare at the screen from day to night, greatly increasing the salary costs of the shopping malls and increasing the difficulty of shopping malls. The electronic anti-theft system can be managed by security personnel. There are only three types of systems, radio frequency systems, acoustic and magnetic security systems, and electromagnetic wave systems.
The working principle of the supermarket security door is to attach an electronic anti-theft tag to the small, high-value and easily stolen goods. At the exit of the shopping mall, there is an inspection security door. When the thief steals the goods with the tag, it passes the inspection. When the door is closed, it will alarm immediately (as if the boarding check at the entrance of the airport), and the normal shopping will invalidate the label when passing through the checkout counter, and will not alarm. For the supermarkets, clothing stores, specialty stores and other places where goods are often lost, Can greatly reduce the loss.