Whether you're looking for added security for your front door or your bedroom door, installing a keypad lock or a fingerprint lock will give added peace of mind that your keys aren't being copied without your knowledge. The Fingerprint ID Door Lock w/Keypad combines these two systems, providing easy access only to those whose unique fingerprints have been programmed and to those to whom you confide your programmed PIN, which can be changed at any time. Six AA batteries are required to use this door lock and are sold separately. The Fingerprint ID Door Lock w/Keypad will accept up to 50 fingerprints in its system, providing keyless access to your entire family or your small business. Since the PIN can be changed regularly, it's an easy way to allow a service person access to your home or business when you're not there — and a much safer way than hiding a key that can be stolen or copied! Four keys are included for emergency entry should the occasion arise. After correctly matching your fingerprint to the one programmed into its memory, the lock body is unlocked, and the system will power off automatically to save electrical power. If the batteries become low, you will hear four alert beeps when the lock is used. Replace the batteries as soon as possible; the Fingerprint ID Door Lock w/Keypad's non-volatile memory will retain all enrolled fingerprints and other setup functions. The Fingerprint ID Door Lock with Keypad is also available for left-handed locks. For doors that also contain a deadbolt for extra security, try the Fingerprint ID Door Lock (available for both left- and right-handed doors.