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1.The lock is made of pure-copper or stainless steel and is very durable;
2.Dissociative knob which prevents external press from destroying; 3.Coming by solt-fog experiment that last over 600 hours; Use Siemens encryption techniques which is counterfeit-preventing;
4.Realizing the parent-card management: use the parent card to add or delete the electric keys;
5.Door-unlock-warning: this can warn the user and ensure100% security.
6.New-type lock barrel with smaller size and backlocking; Static function: d2F;Can register 255 exclusive user cards and support offline network function.