Emtek Keyless Electronic Deadbolt Lock - keyless security has never looked better than Emtek's low profile Modern Keypad Entryset. Leave your keys behind as you walk the dog or ride a bike with the confidence, freedom and security that Emtek Keypad Locks provide. Emtek's Keypad locks fit any door between 1-3/4 inch and 2-1/4 inch thick with a standard bore hole measurement of 2-1/8 inch. They are easy to install and to use. Emtek's keypad locks come factory-programmed with 2 unique and secure user codes for use right out of the box, and can be programmed with up to 20 additional codes of your choice. Codes can be added and deleted at any time. To lock your Emtek keypad, simply push the Emtek button and turn the exterior thumbturn. To unlock it, enter the 4 digit code and turn the same thumbturn. Programming changes can be made easily using the keypad. Emtek's keypads have a protective coating to prevent wear patterns, and are illuminated for easy and 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.