Passcode Entry: This keypad lock offers 20 access codes for family use and a temporary code for single-use guest entry One-Time Code: A one-time PIN code can be set for door opening and will automatically be deleted after use Smart Locking: Features an automatic door lock that can be set to lock in 10-99 seconds and one-touch auto-lock by pressing and holding any key on the keypad for 2 seconds Security Deadbolt: Provides reliable home protection with its sturdy aluminum alloy construction, weather resistance (IP54), durability, anti-peeping user code protection, low battery indicator, and solid lock cylinder. Our deadbolt smart lock is only suitable for 2-1/8" (54mm) door holes, and is not compatible with 38mm door holes Easy Installation