The supermarket security door radio system uses radio waves as the transmitted and received signals, and the detection frequency range is 7. x~8. x MHz. The transmitted signal is a radio signal. It is the same signal as mobile phone and radio, but at different frequencies. The biggest advantage of the radio system is that the system cost is very low and the installation is convenient. However, because its anti-theft label is of loop coil type, the system is vulnerable to interference from some items, such as electronic products such as cash registers, metal objects, etc., causing false alarm or false alarm of the system.

The new generation of channel-type electromagnetic wave system of supermarket anti-theft door is an electronic anti-theft system controlled by software, which uses digital processing technology to integrate with degaussing system, cash register monitoring and closed-circuit television monitoring system. The rapid degaussing plate can be used for repeated degaussing, and the system cost is high. There are two types of electromagnetic wave system: vertical type and channel type. The application environment is mainly in libraries, bookstores, audio stores, hotels, supermarkets, etc.