2. Press and hold a key to activate and unlock. The principle of anti-lock braking is also very simple. All outdoor electronic unlocking methods are shielded by internal circuits. Magnetic lock mainly controls the closing of the door by switching power supply, and generates magnetic force when it is energized. Its design, like electromagnet, is based on the principle that current produces magnetism. When the current passes through the silicon steel sheet of the magnetic lock, the electromagnetic lock will generate a strong suction force to tightly absorb the adsorbed iron, thus achieving the effect of locking the door.