iButton lock, sauna lock, locker lock
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it has metal casing.
the single card or double card opening mode is up to the user.
in case of double card unlocking, service cards'qnty/guest cards' qnty equals to 1/50
it is operating on 6V DC and the batteries last more than one year.
it features a strong projecting latch that guarantees a good performance in locking and unlocking.
a user may use the emergency battery backup to open it in case it is short of power.
both golden and silvery finishes are available