What is the unit of measure for the lock
There is also a ritual in international exchanges, with a symbolic "key" as a representation of friendship.
Lock is not only protective equipment, but also has the "management" and "decoration" role.
The unit of measure is:
Lock is a closed role of the device, which includes the lock, the key and its accessories, generally interpreted as "must use the key can only get rid of the seal", now, in addition to the key to open the lock, you can also use light, Magnetic, sound and fingerprints and other instructions to open.
