Product review (3 stars): Kind of the way a cell phone can be heard through speakers with crappy speaker wire
First of all.  They are under $20 at Home Depot.  Why this guy is charging $161.00 is beyond greed.  I had this lock all of a week.  I dropped it on the floor and it erased all three codes I had put in it.  It was the lock to my office, so I had to cut it off as the backup/factory code was in the office I was locked out of.  If it wasn't the 2 foot drop that blanked it, the only other thing I can think is that my cell phone may have interfered with the codes. Kind of the way a cell phone can be heard through speakers with crappy speaker wire. In a nut shell, Its just more crap stamped out in china.  Look for an American made lock that is only mechanical.