【Electronic Bolt Lock】 This lock features two parts: a black \"fixed\" section and a metal hook. The door needs to be slammed shut to close, and 12V power applied to the wires to unlock. The electromagnetic lock is primarily made of carbon steel, and the lock hook can withstand 150 kg of pull. 【Wiring Precautions】 The lock should not be powered for more than 3 seconds, and the voltage should be 12V 2A. If using a relay with a digicode, ensure everything is switched off when unlocking. If the power supply isn't powerful enough, power the coil separately or use a dedicated power supply for the lock. 【Open via Intercom】 The lock can be opened via intercom with a little DIY. Simply send a 12V 2 amp pulse, and provide a small relay in case of power shortage with a 12V 3 amp power supply. Perfect for securing cabinets to prevent children from entering. 【Energy Saving & Long Lifespan】 Shockproof, puncture-proof, and anti-theft. Mechanical lifespan, under designed load conditions, is approximately 500,000 times. Suitable for doors weighing 0.5 to 4 kg. 【Easy to Use】 Magnetic electromagnetic lock for easy, limitless installation on the left, right, front, back, and allows for mechanical tab release. Built-in unlock status detection. Size approximately 5.7 x 7.2 x 1.3 cm. Ideal for delivery lockers, refrigerators, mailboxes, newspaper boxes, self-service soap dispensers, and dishwashers.