DG-78 1. 100% pure stainless steel structure, firm and durable 2. Change master passwords freely. Master passwords can add or delete any sub-password. 3. There are two kinds of passwords: Master passwords and Sub-passwords. It is easy to manage Mechanical key using for emergency condition. 4. One-key opening function: Freely press any key to open the lock. 5. Free rotating handle, maximum prolong mechanism life and also avoid unlock by violence. 6. U-design handle is the first choice, maximum protect body. 7. It is very easy to change batteries in the lock, just need several minutes on one lock. 8. Password capacity 300. 9. No longer installs the electrical machinery into inside the mortise, which facilitated the maintenance. 10. The installment is extremely convenient, the front lock body, the mortise and the back lock body three parts is very simple and clear.