Product Description: Main Features: -The emergency key is included.(3) -User Changeable Cards - Each user's Card is unique and can be changed at any time. -Each Card 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 -Card reading range 1 - 3 inches -Easy removal and re-installation -Up to 30 different users can be coded -Power saving function while non-operating -Ability to program one card for several locations -Anti-theft and copy, rolling security code for over 4.3 billion combinations -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 Card function Gives users the ability to overide and add new users Card Code memory Non-volatile memory function saved memory won't be lost even when the batteries are worn out. Easy access Proximity card reader allows for easy access especially for young children and the elderly Key override for emergency entry 3 keys high securtiy keys are provided for an override operation. Customized card with anti-theft and copy function. No keys to lose, have stolen, or copied. No wires to run. No computer programming. Quick, easy-to-change code. Your card can be coded easily by you at any time, right on the lock. 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