With the development of science and technology, the traditional anti-theft method of monitoring shopping malls by manpower is no longer suitable, and it will be replaced by high-tech electronic commodity anti-theft system. Theft of retail goods is a common problem in the world. According to foreign statistics, if a commodity is only $9, it needs $849 to recover the loss. I lost 34 yuan. The loss of commodities undoubtedly increases the burden on enterprises. Therefore, loss prevention has gradually attracted the attention of domestic enterprise leaders. As early as the late 1960s, the first electronic article surveillance system EAS appeared in the United States. It fundamentally changed all previous anti-theft measures for customer monitoring. The implementation of anti-theft monitoring on goods has avoided the resistance of consumers, and this anti-theft and deterrent effect has been recognized by many retailers. At present, most large retail enterprises in the world use electronic anti-theft devices. Electronic article monitoring began to enter Asian countries, Japanese, Singaporean, Korean, Hongkong and Taiwan Province provinces as early as 10 years ago, and its installed capacity is also increasing year by year. After 1990s, enterprises in China accepted the electronic anti-theft system, and electronic goods monitoring was installed in shopping malls in commercial developed cities such as Beijing, Shanghai, Guangzhou and Shenzhen. After 40 years of development, the electronic anti-theft alarm system for supermarket goods has developed from a single principle and a single product to a variety of different principles, meeting the needs of different types of stores such as department stores, supermarkets, specialty stores and libraries. If the electronic anti-theft system is subdivided from the form of protection, it can be divided into vertical system, hidden system and channel system. The detection device of vertical system stands conspicuously at the entrance and exit of shopping mall, which has obvious deterrent effect besides detection function. The hidden system is to hide the system under the carpet or ceiling of the exit, which will not affect the overall environment of the store, but also play the role of anti-theft protection, and meet the dual needs of shopkeepers for beauty and anti-theft. Channel system is an effective way to realize supermarket anti-theft. By connecting electronic goods monitoring and cashier at the supermarket exit, channel protection is formed. According to the detection signal mode, it can be roughly divided into radio system, electromagnetic wave system, microwave system, frequency division system, intelligent system and acoustomagnetic system. ○ The tuning fork of acousto-magnetic system will only cause * * * vibration when the oscillation frequency is the same. Acousto-magnetic system (Acousto-magnetic) has realized almost zero false alarm by applying this physical principle. When the acousto-magnetic system tag fixed on the commodity enters the detection area of the system, it will generate * * * vibration, but it will give an alarm only after the receiver receives the * * * vibration signal for four consecutive times (once every 1/50 seconds). Acousto-magnetic system is characterized by high anti-theft detection rate, almost zero false alarm, good anti-interference, and the width of protection exit can reach 3. 5 meters. There are two kinds of anti-theft labels, which can protect most kinds of goods in shopping malls and can be degaussed repeatedly. Even at the POS cash register, the system can still work normally. Acousto-magnetic system includes vertical system, channel system and concealed system. There are many models of 10 to choose from, which can be widely used in department stores, supermarkets, specialty stores, video stores, grocery stores, pharmacies and office buildings. ○ Radio frequency (RF) of radio system uses radio waves as transmitting and receiving signals, and the detection frequency range is 7.x ~ 8.x MHz. The biggest advantage of wireless system is its low cost and convenient installation. However, because its anti-theft tag is a ring coil type, the system is easily disturbed by some items, such as electronic products such as cash registers and metal objects. , resulting in false alarm or no alarm. The radio system has two kinds of labels, soft and hard, which can protect most items in shopping malls. The distance between the two brackets is generally not more than 0.9 meters, which is usually used in shopping malls with only one entrance and exit. There are two kinds of radio systems, vertical and tunnel, which are used to protect department stores, clothing stores and supermarkets. ○ Electromagnetic wave system The electromagnetic wave system uses electromagnetic waves as detection signals. The tag of electromagnetic wave system is the smallest, and the tag price is cheap. It can be demagnetized repeatedly, but it is easy to be affected by magnetic or metallic substances and produce false positives. The width of the protective exit is generally about 0.9 meters. The system will not affect magnetic objects (such as audio tapes, video tapes and magnetic cards). The new generation channel electromagnetic wave system is an electronic anti-theft system controlled by software, which adopts digital processing technology and integrates with degaussing system, cashier monitoring and closed-circuit television monitoring system. The fast degaussing board can be used for repeated degaussing, and the system cost is high. There are two kinds of electromagnetic wave systems: vertical and channel. The application environment is mostly in libraries, bookstores, musical instruments, hotels, supermarkets and so on. ○ Microwave system Microwave system uses microwave as detection signal, which is not easily disturbed by the surrounding environment. It can be installed flexibly and concealed (for example, hidden under the carpet or hung on the ceiling), and has the advantages of being suitable for decoration and beauty in the store. However, due to its wide application range, it is impossible to arrange goods in a certain area, which will limit the use space of businesses with land and money, so it is suitable for large department stores, music stores and fashion stores with large stores. ○ Frequency division system SplitFrequency is an anti-theft system that adopts high-tech frequency division technology and ultra-low frequency radio wave signals. When the anti-theft tag enters the detection area, the tag receives the signal from the transmitter, divides it into two halves, and then sends the information divided into two halves to the receiver. Only when the receiver receives half of the signal will it give an alarm, which can effectively avoid the interference of other radio waves. The system has the advantages of light label, small size, low price, stable performance, high detection rate, good anti-interference, and not easy to cause false positives. Products are divided into two types: vertical and hidden. It is an ideal anti-theft system for clothing stores. ○ Intelligent system Intelligent system applies unique technology, which is a system integrating integrated circuit control, battery drive, hard tag and alarm. When the label is pried or taken out of the mall with the goods, the system will automatically alarm. The system can protect the goods in the whole shopping mall, and the labels can be reused without damaging the goods. Used to protect valuables, such as fashion, leather, fur, etc. ○ Destruction principle The anti-theft system based on the system destruction principle is a hard tag or magnetic lock. There is ink in the hard label. When a thief tries to take off the hard label, the hard label will spray ink, polluting the goods and the thief's body. Electromagnetic locks are extremely difficult to remove, and forced removal will damage the goods. Convenient use, good deterrent effect and low cost. It is used in clothing, glasses, jewelry, ties, silk fabrics and other commodities. Labels can be reused. In addition to the anti-theft system of electronic products, there are also closed-circuit television (CCTV) closely related to anti-theft in shopping malls. Closed-circuit television monitoring system can monitor the situation in shopping malls and find suspicious events, which can play a deterrent role. Compared with the electronic anti-theft system, its advantage lies in that it can not only effectively monitor the situation in the shopping mall, but also record the incident or theft process through video tape as the basis for tracing and collecting evidence in the future. Conditional shopping malls can combine electronic anti-theft system with closed-circuit television, which can effectively prevent internal and external thieves from committing crimes, improve the anti-theft effect and reduce the loss of retail goods. If you open each page carefully, you will find some books on a page stuck together. When you tear it open, you will find a metal strip inside. This electronic anti-theft device has been used in bookstores and supermarkets for a long time. Now some printing houses add this metal strip before leaving the warehouse, which saves the trouble of adding a copy by hand in the bookstore. You are talking about the degaussing process. In fact, after a high-frequency alternating magnetic field, the long magnetic field becomes weak, so it can pass the magnetic inspection. Many bookstores generally don't degauss, but take books out of the counter, but the magnetic inspection is still working.