Main feature: 
Operated by digital keypad Transfer motion with variable speed motor Optional override mechanical lock International standard A.D.I keypad Optional 3,4,5,6 digits setting Code appearance on screen or not Keypad auto lock after consecutive 4 wrong code or card(optional 0,15,30 minutes) Time dilay before opening (optional 0-24 minutes setting ) low battery announcement-------battery status can be checked Optional master code and master credit card setting Specially designed space for lap-top computer to assure security for your data Low energy consumption: 4 AA size alkaline batteries will last 18 months, based on 5 times Door opening per day. Single-time molded case and unique spray coating technique to keep the case rust - free for 15 years
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