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Functions and features:By code to open door, don't need card or key
Also have two types: public type (open type) and private type (stand alone type)
Two grade manage: master code and user code
Also can make to three grades manage: super master code, master code, and user code
Low power alarm: when battery have not enough power, lock will have a indication
Emergency open: when battery have not power, and can't open lock, at this time can use a external power supply to insert into a socket of lock to supply power to open lock
