Currently on the market a lot of electronic locks, a button-type electronic locks, fingerprint lock, eye iris lock and so on. How are these locks easy and safe? Ads are too good to say, is that the case?
Lock and the key of the exact time of the invention has not test, and the ancient civilizations have their own invention of the lock and key.
Lock is the need for regular lubrication maintenance, otherwise it will open difficult, rust, and even twist the key, or the internal lock block stuck open.
