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 electromagnetic wave system of the supermarket anti-theft door has the smallest label, and the price of the label is also cheap. It can be repeatedly demagnetized, but it is vulnerable to the influence of magnetic or metal substances and generate false alarms. The width of the protected exit is generally about 0.9 meters. The system will not affect magnetic objects (such as audio tapes, video tapes, magnetic cards).