Electronic locks are among the new generation of devices. Such locks have a high degree of reliability. Electronic lock is an electronic device designed to prevent access to the premises of unauthorized persons, or conversely, to restrict exit from the premises. The decision on access to persons in the premises shall be based on signals from various sensors: magnetic card readers, bar codes, contact memory sensors, biometric sensors, typesetting keyboards, remote controls, etc. Often this type of the lock is part of a complex electronic system for access control, sometimes inseparable from it as the electromechanical actuators and electromagnetic locking devices. Electronic locks come in several types. Magnetic lock closure device is based on the magnetic interaction. Passive magnetic locks do not receive supplementary feeding and have less power, so used to locking cabinets, as buttons on clothing, handbags and so on. Active magnetic lock consists of a powerful electromagnet and a mate in the form of a permanent magnet or just strips of metal with high magnetic permeability. Usually it is an integral part of the electronic lock. Power of the electromagnet should be sufficient to preclude the power to open doors without any visible damage. The reliability of the lock depends on the quality of the magnet. Magnetic lock is often used on the doors of industrial premises, automatic gates and intercom. No moving parts, simplicity of design, ease of connection to the electronic lock are the advantages of this device. The need for a power source is no electricity supply immediately lock opens and the relatively large dimensions of the locking device compared with conventional bolt are the flaws of the magnetic lock. Electromechanical lock is a kind of electric lock, which is based on the mechanical impact on the locking mechanism. Mechanical action is created by a solenoid or a small motor. Locking force is created by mechanical elements by means of springs. Extreme position crossbar latch, actuated by a solenoid or motor. Such devices can reliably protect against picking. In the motor locks bolt is driven by an electric motor. Usually, the transfer of mechanical force is used worm gears. These locks bolt driven metal core, which is drawn into the solenoid. To improve the security of the apartment, experts recommend installing a door at least two locks of different systems and manufacturers (one - lever, the other - cylinder). By doing this you already complicate the work of an attacker, since he will have to use more tools and likelihood of success decreases. There are many types of mechanical locks, but each of them necessarily has a frame, bolt and mechanism of secrecy.