Emtek E4817US15 Brushed Nickel Single Cylinder Solid Brass Electronic Keypad Handleset - keyless security has never looked better than Emtek's Electronic Keypad Handleset. Leave your keys behind with freedom and security that Emtek's keypad deadbolt provides. Emtek's Electronic Keypad locks fit any door between 1 3/4 inch and 2 1/4 inch thick with a standard 2 1/8 inch bore measurement. Easy to use installation and programming instructions are provided. This deadbolt is factory programmed with 2 unique, secure user codes for use right out of the box, and can be programmed with up to 20 user codes of your choice. The codes can be added or deleted. Easy lock and unlock operation, enter the 4 digit code and turn the exterior thumb turn. Programming changes can be easily made using the keypad. Keypad has a protective coating to prevent wear patterns. The keypad is illuminated for quick operation after dark. This fantastic deadbolt even has a low battery indicator to let you know when it's time to change the battery.