The X-7 lock offers a convenient and secure lock system solution. Three ways to unlock: fingerprint, user code, or key. Up to 100 fingerprint users could be registered in the system. Up to 100 user codes could be programmed into the system. Individual fingerprint user and user code deletion. Build-in touch active sensor: one touch to unlock. Self-learning ability: fingerprint template is updated after every fingerprint entry. Two ways to login the system: programming code or administrator fingerprint. Support passage mode: stay at unlock state during the passage mode. Memory function: power run-out or system reset will not cause the loss of registered fingerprint(s) and user code(s). Reversible lever: lock fits both left-handled and right-handed door. Reversing lever controlled by key. Schlage C key as an override key. Key override feature could be disabled. 9V battery may be attached as an additional power source. Double-shell heavy duty construction design. Low power alert. Specifications: Optical sensor. Standard 12-key keypad. Tubular latch. Adjustable backset 2 or 2 . Fit door thickness between 1 and 2 (Order screws for door thickness between 2 and 2 ). Operation temperature from -4F to 150F (-20C to 65C). Powered by 4 AA Alkaline batteries (NOT included). Lock designed for INTERIOR door ONLY.