At present, the book anti-theft system that can be seen in the market is roughly three products with different principles, namely electromagnetic principle, acoustomagnetic principle and wireless radio frequency principle. The labels used by products with different principles are not connected with each other. What kind of anti-theft system will require different labels, but the equipment consumables (labels) using the same principle are basically the same. The tags used in the acoustomagnetic principle system and the wireless radio frequency principle system are expensive, bulky and not concealed. In contrast, the tag used in the electromagnetic wave principle system is cheap, which greatly reduces the user's investment in consumables. Moreover, the tag is thin and small, with strong concealment, and can be repeatedly charged and demagnetized. The most effective way to deal with theft, which is also the budget that every library (bookstore) can afford, is to install an electromagnetic (EM) monitoring system, which will not affect the operation of the library (bookstore) and reduce the loss of books by more than 95%.

The basic system consists of transmitting antenna (door), receiving antenna (door), alarm host and induction magnetic stripe. The antenna emits electromagnetic waves to monitor the special magnetic stripe placed in the book to be protected. If charging and degaussing strips are used, charging and degaussing equipment is required. General configuration also has a loop tester.

Detection gate: It consists of a transmitting gantry and one or two receiving gates. The launching gantry is centered, and the receiving gantry is symmetrically arranged on both sides, forming two channels through which book buyers can enter and exit the book mall.

Alarm device (alarm host): connected with the detection door through special wires.

Induction magnetic stripe: there are permanent magnet type and charging degaussing type, and users can choose according to their needs. When the induction magnetic stripe passes through the detection gate channel, it will give an alarm.

Book inspector: used to check whether there is a magnetic stripe in the book or whether the magnetic stripe reaches the alarm sensitivity.

Degausser: refers to magnetizing the new book in storage with a composite magnetic stripe; Degaussing simply involves dragging a book with a magnetic stripe through the magnetizer.