This lock provides convenient living and multiple options to suit your lifestyle. It can be unlocked with 20 fingerprints, 100 PIN codes, mechanical keys for family members. You can choose any method to unlock your door. The multi-functional lock makes your life more convenient. 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.