1. Pure stainless steel mechanical rational structure enable for using more than 10 years. 2. It is very easy to change batteries in the lock,just need several minutes on one lock. 3. Using 4 x 1.5V standard alkaline batteries. 4. Unlock ways: Fingerprint or Keypad or Mechanical key. 5. The fired users can be deleted individually without any effect on the application of the other users. 6. If the fingerprint is not input correctly. The handle is free handle; it can provide the door against opening by fore, and prolong the using of the mechanism of the lock. 7. Fingerprint user capacity 150 and password capacity 78. 8. especialy suitable for installation by non-professionals.