There are four main technologies in the EAS system, namely radio frequency, electromagnetic, acousto-magnetic, and radio frequency identification. Because electromagnetic and radio frequency products are cheap, and their labels are usually permanently affixed to commodities or commodity packaging; while microwave and acousto-magnetic labels are more expensive, most supermarkets generally choose electromagnetic and radio frequency. So take electromagnetic and radio frequency instructions.

Radio Frequency
It is mainly composed of three parts: detector, decoder and electronic label, auxiliary equipment and unlocker.
Electronic labels are divided into soft labels and hard labels. Soft labels have lower cost and are directly attached to harder commodities. Soft labels cannot be reused; hard labels have higher one-time costs than soft labels, but can be reused. Hard labels must be equipped with a special nail remover, which is mostly used for soft and easy-to-penetrate items such as clothing. The decoders are mostly non-contact devices with a certain decoding height. When the cashier is cashing out or bagging, the electronic tag can be decoded without touching the degaussing area. There is also a device that combines a decoder and a laser barcode scanner, so that the collection and decoding of goods can be completed at one time, which is convenient for the cashier's work. This method must cooperate with the laser barcode supplier to exclude the two. Mutual interference, improve decoding sensitivity. The detector is generally a detection system device at the entrance and exit of the shopping mall or the cashier passage. After receiving the correct amount due from a customer for the purchase of an item, the cashier can authorize the item and legally leave a designated area by neutralizing the label affixed to the item. When undecoded goods are taken out of the mall, when they pass through the detector device (mostly in the shape of a door), an alarm will be triggered, thereby reminding cashiers, customers and mall security personnel to deal with them in time.