1. Unique design with patent protection, rational structure and cleanness surface 2. Easy installation and replacement of the lock requiring no additional holes. 3. Upper Slide cover reader protection. Anti-moisture and dust, applicable in all weather. 4. Easy and convenient to replace batteries. 5. U-design handle for favorite choice, maximum body protection. 6. Free rotating handle to avoid violent damage when it keeps working state. 7. Pure stainless steel mechanism system lasting over 10 years. 8. Extra opening door record function available. 9. Individual fingerprint user can be added or deleted 10.Fingerprint only to open the door, specially convenient for the old and child