【Electronic Lock with Latch】There are two elements, the \"fixed\" part painted in black and the metal hook. We have to slam the door Compatible with to close it and apply 12V to the wires Compatible with to unlock. The electromagnetic lock is mainly made of carbon steel, the latch hook can withstand a pulling force of 150 kg. Electromagnetic Lock 【Open via Intercom】The lock can be opened via intercom with a little DIY fix. You just need to send a 12V and 2 amp pulse, so make sure a small relay is included with a 12V 3A power supply in case of power failure Compatible with to secure the cabinet so that children cannot access it. 【Compatible with Precautions for Connection】Electromagnet. The lock should not be powered on for more than 3 seconds and the voltage must be 12V 2A. If you use a relay with a digital code and everything turns off when you unlock. Since the power supply is not powerful enough, you must power the coil separately or install a dedicated power supply Compatible with the lock. 【Energy Saving and Long Lifespan】Shockproof, puncture-proof and anti-theft. Mechanical life, at design date, approximately 500,000 times. Suitable Compatible with doors weighing 0.5 to 4 kg. 【Easy to Use】Electromagnetic solenoid lock Compatible with easy installation, without restrictions Compatible with left, right, front, back and allows mechanical unlocking position Compatible with the pins. Built-in detection of unlocking status. Size approx. 5.7 x 7.2 x 1.4 cm. Applications: delivery lockers, refrigerators, mailboxes or newspaper boxes, self-service lockers, counter. Condition: 100% Main material: Carbon steel Surface treatment: Electrophoretic paint coated (Neutral Frog experiment over 500 hours) Working mode: Independent type (Turn off and close the door locked; Turn on unlocked) Electrical parameters: DC 12V 2A Mechanical life: Under load condition, approximately 500,000 times Electromagnet life: Under rated operating condition, more than 1,000,000 times Lock hook strength: 150 kg force (no permanent deformation) Ambient temperature: -40~60 Size: Approx. 5.9 x 7.3 x 1.3 cm / 2.32 x 2.87 x 0.51 inches Compatible with packing weight: 170 g