Sargent & Greenleaf Electronic vault lock with square bolt, two battery keypad and keypad extension for reading audit trail. Same mounting as the 6400 & 6500 series mechanical vault locks. Easy retrofit in most applications. Replaces both direct and indirect drive lock. Automatically locks when the safe or vault door is closed and the boltwork is thrown. 400 event time and dated stamped audit trail managed by easy to use PC software. Time delay up to 99 minutes. Built in bolt position indicator. Duress capability, an optional duress module required to use this function. Recommended only for applications that include a secondary lock override or separate service door.