MORNING INDUSTRY INC HKK-01SN Touchpad Electronic Doorknob, Satin Nickel Touchpad Doorknob For Keyless Entry Into A Home Accepts Up To 6 Different Codes/users From 2-8 Digits Each Codes Can Be Individually Added Or Deleted Easy Installation no Wiring Or Drilling Required Fits Standard Door Prep Simple programming Accepts up to 6, 2-8 digit codes Add or delete codes individually as needed Built-in warning alarm sounds after 4 failed attempts Includes optional auto-lock function