Electronic lock with the boltThere are 2 elements, the "fixed" part painted black and the metal hook. We have to slam the door to close it and put 12v on the wires to unlock it. The electromagnet lock is mainly carbon steel material, the lock hook can bear the pull of 150kg. Precautions when plugging inThe lock should not be powered for more than 3 seconds and the voltage should be 12V 2A. If you use a relay with a digicode and when you unlock, everything goes out. Because the power supply is not powerful enough, you have to supply the coil separately or put a dedicated power supply for the lock. Open via intercomThe lock can be opened via intercom with a little DIY. You just have to send a 12v and 2 amp pulse, so provide a small relay in case of lack of power with a 12v 3 amp power supply. Perfect for securing closets, so children can't get in. Energy Saving & Long LifeShockproof, puncture proof and anti-theft protection. Mechanical life, when designing the load condition, about 500,000 times. Suitable for 0.5-4kg door. Easy to useMagnetic electromagnet lock for easy installation, no limits on left, right, front, rear side and allows position mechanical release of the tabs. Built-in unlock status detection. Size approx. 5.7 x 7.2 x 1.3cm. Application for Delivery cabinets, refrigerated cabinet, mailbox or newspapers, self-service cabinet, counter.