Prior to the batteries dying, the interior LED indicator light will flash amber/red or green/red depending on lock/unlock status. In addition, the exterior keypad flashes red and the lock beeps for three seconds upon code entry to notify the user far in advance to change the batteries. When the batteries die, the codes are stored in non-volatile RAM on the RF card. The lock bolt will remain in the position it was last in. The motor will not operate. Entrance is still availabe with a key.