1. A square shell, elegant

  2. Memory, and can keep 2000 cards and 2010 the user' s password

  3. Has three ways to open the door. Cards, passwords, card add password

  4.  No card, you can set a password to open the door

  5. has security protection mode

  7. With a doorbell button, and Button to open  contact

  8. To restore the factory settings, only to return to the factory programming password, memory    Does not lose all the informati
  9.water proof.