Electronic door locks use programmable memory and data reading devices, and their keys are difficult to copy. There is a 3.5×3.5mm special electronic chip in the key, which stores a specific password. When the key is inserted into the lockhole, the password is sent to the memory in the lock, and a magnetic field is generated at the same time, and a voltage is generated in the coil on the chip, which is used as a power source to unlock the lock. If the password in the key matches the lock, the lock will be opened. .

Extended information:

This fully mechanical key combination lock should have the following characteristics.

1. The operation must be easy. Using the operation method of a touch-tone telephone, you can unlock the lock by pressing several keys one after another in sequence. If you use a six-digit password, you only need to press the key six times. Some mechanical key digital locks use the number of key presses to represent the number. For example, the password 999 requires pressing the key three to nine times to 27 times. If there are more digits, the operation will be even more inconvenient.

2. Changing the password must be simple and easy for the owner. In order to be able to choose a set of passwords that is easy for you to remember, the arrangement of the optional password sets must be consecutive. Taking the four-digit code as an example, you can choose any one of the ten thousand passwords from 0000 to 9999, and there cannot be a useless or unselectable group in the middle.