This is a smart lock, which can be widely used in many scenarios.
The outer shell is made of very strong stainless steel, to ensure
high level of security demand. It applies screw thread M20 or
M22 so that the old lock can be replaced without drilling new
holes. The electronic cylinder gives brand new function. No
elctrictiy or battery is needed for the lock. One electronic key
(ONLY) with battery can manage as many locks as needed. (Yes, the
housekeeper does not have to carry a bundle of keys.) Each key
is securily encrypted. The key will be authorized to nominated
lock(s).
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