This biometric fingerprint lock is designed to fit standard doors (either left or right handed). 

You can replace your existing single cylinder deadbolts or install in place of single cylinder deadbolts in new doors. 

The biometric fingerprint lock stores fingerprints for up to 30 users - 4 administrators and 26 users with one fingerprint each (It's recommended to have 1 or 2 administrators and 13 users with a fingerprint stored from each hand). The fingerprint scan time is less than 1 second and can recognize and match a stored fingerprint in 2 seconds or less.

This deadbolt lock operates on 4 AA batteries which aren't included. The unit is rated to work in a temperature range from 0-131 degrees Fahrenheit and a humidity range of 0-99 percent. If you live in a cold weather state (Like we do in Wisconsin), we recommend lithium batteries. They should last at least 1 year under normal conditions (5000 cycles with 1 set of long life batteries under test conditions).

This unit has a low battery indicator to let you know when to change the batteries. None of the saved fingerprints or settings will be lost during battery replacements.

Also includes 3 overriding keys that let you open the lock like a tradition deadbolt.