What locks this key?

Unlocking principle: the card is magnetic. Insert the handle, suck the corresponding magnetic marble to a suitable position, and twist the handle to open the door.

Usage: Not for my own home, my company or my factory. I want to use the shower room, but the lock is too big to put in the closet. So we only use small hotels.

Defect of magnetic ball lock: 1 easy to degauss, and it is not easy to find out the problem after degaussing. The key card is difficult to copy, lose or degauss, and there is no place to match it.

This kind of lock may still be used in guest houses and small hotels, but it is not completely extinct. People locked with this can't surpass 50 yuan in one night. Friends who can see this answer in Zhihu seldom go to 30-40 yuan's guest house.

At present, hotel restaurants are basically locked by swiping their cards. The hotel room card can open the door, power on, get on the elevator, eat, take a shower and spend all kinds of money. As an outdated product, magnetic card ball lock has gradually withdrawn from the market as early as 10 years ago.