This lock stores up to 20 PIN codes and 50 fingerprints. Unlocking your door with a PIN code or fingerprint is much easier and faster than using a key. With the auto lock setting, you do not have to worry about forgetting to lock the door. This electronic door lock consumes little power and lasts up to 1 year* with 4 AA alkaline batteries. When the batteries run low, a low battery alert will remind you to change your batteries, preventing a lockout. Voice guidance guides you through configuration of the lock without the need for an instruction manual. English, French, and Spanish voice guides are available. The door lock installs in minutes with just a screwdriver and is suitable for most standard door preps.