EAS is the abbreviation of Electronic Article Surveillance.The EAS system came out in the United States in the mid-1960s. It was originally used in the apparel industry and has now expanded to all around the world. Its application areas have also been extended to various industries such as department stores, supermarkets, and books, especially in large supermarkets (warehouses).


AM is the abbreviation of Acoustic Magnetic,which uses the resonance phenomenon generated by the tuning fork principle.When the frequency of the transmitted signal (alternating magnetic field) is the same as the oscillating frequency of the AM tag, the AM tag will cause resonance similar to a tuning fork and generate a resonance signal (alternating magnetic field); when the receiver detects it continuously 4-8 times (adjustable) ) After the resonance signal (every 1/50 second), the receiving system will issue an alarm. The characteristics of the AM system are high anti-theft detection rate, almost zero false alarms, not shielded by metal tin foil, good anti-interference, and wide protection (the maximum width of a single system can protect 4 meters).


RF is the abbreviation of Radio Frequency,which is also an abbreviation for a high-frequency alternating electromagnetic wave.The alternating current that changes less than 1,000 times per second is called low-frequency current, and the one that changes more than 10,000 times is called high-frequency current. Radio frequency is such a high-frequency current.

The difference between AM SYSTEM and RF SYSTEM

The main difference between the AM system and the RF system is that the frequency is different, which results in the different penetration of radio waves (the ability to bypass obstacles).

AM system has low frequency and strong penetration, and has low sensitivity to metal. Some products with metal have a certain protective effect.

Due to the high frequency and poor penetration of RF system, products with metal are almost unusable, such as chocolate and chewing gum.

AM security hard tag and RF security hard tag
 Internal display of RF tags

In general, the RF tag contains coils and springs, steel bowls and steel balls.The quality of the tag is mainly determined by the quality of the coil and the tension of the spring. Coils are generally divided into all-copper and copper-clad aluminum.

  Internal display of AM tags

Under normal circumstances, the AM tag contains a magnetic bar, and the quality of the magnetic bar determines the quality of the tag, which has a length of 25mm, 33mm and 39mm.

How to open the EAS tag?

Generally, all EAS tags are magnetic, and all can be opened with a magnetic remover. For some AM super tags, a manual unlocker is also needed to open.

 Magnetic unlocker

According to different needs, the Gaussian of the remover can be from 4000 to 20000.

 Handle detacher

This kind of detacher is generally only used to open AM super tags.

The detection distance of AM SYSTEM and RF SYSTEM

Regardless of the AM system or the RF system, the detection distance of hard tags is wider than that of soft labels.

For AM systems, the detection distance of hard tags can generally reach 3 meters, under the circumstances that the surrounding environment and various performances are good.While the detection distance of soft labels is generally more than 1.6 meters, which will be a  good performance .

For RF systems, the detection distance of hard tags can generally be up to 2.6 meters, while the detection distance of soft labels can only be up to 1.2 meters.

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