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  
4.Realizing the parent-card management: use the parent card to add or delete the electric keys;Door-unlock-warning: this can warn the user and ensure100% security.
5.New-type lock barrel with smaller size and backlocking;
6.Static function: d2F;Can register 255 exclusive user cards and support offline network function.