With automatic locking deadbolt, the keyless deadbolt lock can avoid forget locking. Features 6 access codes for family use and available temporary code for guest single entry. When your lock suddenly runs out of power or you forget the password, you can use 2 back up keys to unlock. Mute function of keyless entry door lock protect the password from being stolen for home security. The electronic keypad deadbolt is easy to install, SIGNSTEK also attaches an installation manual for you to view and download.