Gate set from EM technology library, glass material, high-grade mechanical plastic and solid wood for aesthetics and certainty. Magnetic gates are usually located at the main entrance / exit of the library. Has the effect of detecting and generating an alarm signal when a document borrowed from the wrong process is brought out of the gate. Only when documents are registered to borrow properly at the librarian’s counter will there be no alarm when passing through the gate. The gate can have 2 wings (1 aisle) or 3 wings (2 aisles), or more.