DG-97A 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 (Using 4x1.5V standard alkaline batteries) 3. Unlock ways: Fingerprint or Keypad or Mechanical key. 4. If the fingerprint is not input correctly. The handle is free handle; it can prevent the door being opened by force and prolong the life of mechanical parts. 5. The fired users can be deleted individually without any effect on the application of other users 6. Anti-dust,anti-moisture design,reasonable and safe. 7. Fingerprint user capacity 150 and password capacity 78. 8. 100% U.S. standard tubular latch cylinder lock 9. Very easy to install and suitable for unprofessional user to DIY (Do It Yourself), Especialy suitable for installation by non-professionals in ordinary family