Product Description: Main features: -the emergency key is included.(3) -user changeable pins - each user's pin is unique and can be changed at any time. -each pin can be added or replaced individually by homeowner. -convenience - no more bulky key rings to keep track of; no more lost keys, rekeying expense or inconvenience -easy installation and hassle-free management -protection function against burglar or mischief -easy removal and re-installation -up to 30 different users can be coded -power saving function while non-operating -deadbolt encased with solid brass cylinder housing for added security -uses 4aa alkaline batteries up to 1 year of operations.(batteries not included) No external power sources required Just 4 standard double a batteries to do the job. Providing easy installation. Smart battery change indicator The alarm will sound with red lamp flashes to indicate the batteries are low. Master pin code function Gives users the ability to overide and add new users Password memory Non-volatile memory function saved memory won't be lost even when the batteries are worn out. Key override for emergency entry 3 keys high securtiy keys are provided for An override operation. Customized pin from 1-12 to lock and unlock your door. No keys to lose, have stolen, or copied. No wires to run. No computer programming. Quick, easy-to-change combination. Your combination can be set easily by you at any time, right on the lock. Automatic disabling of number-pad after 6 failed attempts to enter pin. All functions will stop for 30 seconds if the wrong password is entered more than six times by mistake. It is designed to protect it from burglars and mischief Design for easy installation and removal Easy installation and removal thanks to the special design to utilize the existing key hole in the door. Installs and removes in just minutes. Fits any door.. Water resistant When there is a storm and your lock gets wet you are still assured access to your home Audible and visual feedback confimation of lockset activation: Locked: Red light and two audio beeps Unlocked: Green light and one audio beep Automatic(15 sec delay) or manual locking functions You may program to automatically lock the door immediately or after 15 seconds after the door is closed at your convenience. Glow in the dark 12 keys keypad No need to look for your keypad its glow in the dark feature lets you see your keys even in the poorest lighted conditions