I BOUGHT THE LOCK FOR A SECURITY DOOR. I USUALLY LEAVE THE REGULAR DOOR OPEN SO THAT AIR CAN FLOW THROUGH THE HOUSE. I TAKE MY DOG OUT SEVERAL TIMES A DAY AND GO TO THE POOL DAILY. IT'S GREAT NOT TO HAVE TO THINK ABOUT KEYS. I HAVE HAD IT FOR OVER A YEAR, AND IT IS ONE OF MY FAVORITE THINGS.