This is an electronic lock that operates in a manner similar to a push-button telephone. If the password is the same as the one already agreed upon, an electrical signal is output to drive the electromagnet or the small motor to open the latch to complete an unlocking process. According to relevant information, the study of such locks began in the 1930s and has long been used in some special places. The original intention of studying such a lock is to improve the safety of the lock, because the key amount (the amount of the password) of the electronic lock is extremely large, and it can be matched with the mechanical lock to avoid the problem that the key is copied. Under the premise of high security, another feature of it - without the need for a key - is appreciated by more and more people. Because people carry a lot of keys, and the electronic lock only needs to remember a set of passwords, no need to carry metal keys, eliminating people's troubles. This is also the motivation for many inventors to research popular electronic locks. After entering the 1980s, with the advent of electronic lock ASICs, the size of electronic locks has shrunk. Reliability has improved and cheap products have begun to emerge. Practicality is already in place, and it can be said that there are already conditions for impacting the mechanical lock market. However, contrary to expectations, the market is still the world of marble-type mechanical locks. The status of mechanical locks has not been shaken, but also developed. The keys that people carry are not reduced. The use of intelligent electronic locks is limited to a certain extent, and there is no obvious progress, and it is more difficult to popularize.