Electronic Single Cylinder Deadbolt Electronic Deadbolts function similarly to single cylinder keyed deadbolts, but with an exterior numeric keypad to unlock the door from the outside and an interior unit with a thumb turn button that can quickly lock and unlock the deadbolt from within. LockState"s DB500 electronic deadbolt offers a high-tech alternative to your typical mechanical deadbolts. Featuring improved security features like an illuminated keypad that enables you to program up to six user codes, and optional auto-locking function that relocks the door after opening, the DB500 offers both ease of use and increased peace of mind. Perfect for protecting your home or business while simultaneously providing selected access to guests, cleaning staff, and employees. No matter where you choose to install it, the DB500 is the ideal solution to all of your security concerns. Features: Keyless Entry - Never Fumble for Keys Again Optional Auto-Locking Function Relocks Door After Opening Illuminated Keypad for Easy Viewing in the Dark Program up to 6 User Codes User Codes can be 4-10 Digits in Length Utilize One-Time User Codes for Cleaners or Guests User Codes can be Temporarily Disabled (Locked Out) Delete User Codes Individually or All At Once Reversible Lock Works on Both Right and Left-Handed Doors 2 Emergency Override Keys Included Lockout Function Disables Lock for 45 Seconds After 5 Incorrect Entries Low Battery Indicator 1 Year Electrical Warranty Specifications: Backset: Adjustable. Fits Both 2-3/8 or 2-3/4 Inches Cross Bore: 2-1/8 Inches Edge Bore: 1 Inch Door Thickness: Fits 1-3/8 to 2 Inches Latch: Single Cylinder Deadbolt Latch Batteries: 4x AA (1