No.1 in Security! Perfect for Your Home! Samsung Smart Door Lock! The Stronger Double Claw Bolt Locking System Infra-Red Security Sensor to Prevent Unauthorized Entries Password and Smart Card Double Authentication Mode The Stronger Double Claw Bolt Locking System Providing the door lock with total protection from forced entry/ the two claw bolts are added to the sides of the original bolt and further enhance security.<br />